Create er diagram order processing systemlavori

As a student, I'm working on a project that involves the development of an app for the buying and selling of vehicles. The primary goal is to create a platform that facilitates this process in a smooth and secure manner. Key Features: - Sign up and sign in for users ( admin, seller, buyer) - In-app chat functionality - Payment processing - User ability to post vehicles for sale - A detailed description and image upload for each vehicle Integration Requirements: - Incorporation of a reliable payment gateway to facilitate secure transactions or to choose cash method - Implementation of location-based services to help users find vehicles in their place The ideal developer for this project should have experience in e-commerce app development, particularly those involving ...

Send me samples of your best Interactive Customizable VR Backgrounds work. I'm seeking an experienced Unreal Engine developer to create custom virtual reality backgrounds for interactive installations. Key Requirements: - Customizable VR Backgrounds: The backgrounds must be fully customizable to fit various interactive scenarios. The ability to tweak elements like colors, textures, lighting, and spatial layout is critical to achieving the desired immersive effect. Ideal Candidate: - Proficiency in Unreal Engine: A solid grasp of Unreal Engine is non-negotiable for this project. You should be able to design and implement complex, interactive VR environments within this software. - UI/UX Skills: While not mandatory, additional skills in user interface and experience design ...

I'm the owner of SquareShare, a real estate fractional ownership platform. I'm searching for a talented and experienced designer to develop a unique and impactful logo, along with a brand charter. Key elements...industries - Experience with digital platforms would be advantageous Tasks to be performed: - Conceptualize, design and refine the logo for SquareShare - Develop a brand charter that includes color scheme, typography, and imagery - Assist in implementing the brand identity on our platform Anticipated features of the platform include property listings, fractional ownership management, and payment processing. These elements should be considered in the logo and brand charter's design. We're looking for someone who can bring our brand to life visually ...

...of a skilled developer to create a seamless mobile app for both iOS and Android, alongside an efficient web application. The mobile app should allow users to register, order food and beverages, and receive push notifications regarding their orders. The web application should serve as a central platform for managing orders and inventory. I specifically prefer real-time inventory tracking to ensure accurate information at all times. Key requirements: - User registration and login - Order placement and tracking - Push notifications for order updates - Real-time inventory tracking Drive app for iOS and Android: Allows users to order products with an intuitive mobile app. 2. Website: Same as point #1. 3. Administration web application: Provides a dashboa...

Looking for a specialist to develop a smart kitchen and full delivery system that enhances our financial performance. This will be a microservices project, with each component catering to a specific aspect of the business. Key Features: -Smart appliances control: Adjusting appliance settings remotely. -Inventory management: Keeping track of stocks and supplies. -DLC (date of expiration) tracker from photo -> giving signals when the food need to be put in trash - Road optimization - Order dispachers - Live delivery guy tracking - Finance overview Delivery Tracking System: -Real-time GPS tracking: For live updates on delivery status. -QR code scanning: Giving access to essential order information. -SMS notifications: Keeping our customers informed. Reporti...

I'm looking for a software developer who can create a custom audio player for Windows. The main features of this software include: - Play MP3 audio files: The software should be able to play audio files that are stored in cache memory. It's crucial that the player has a smooth and user-friendly interface for easy playback. - Auto-update from an online source: I would like the software to be capable of periodically updating the audio tracks from an online source. The method of update can be the most convenient for you to implement. I do not need features for managing the audio tracks (e.g., playlists, adjusting track order, or deleting tracks). The primary focus is on the playability and auto-updating of the tracks. The ideal developer for this project should ha...

This project aims to automate the order confirmation process for transactions using Pipedream, a workflow automation platform. Data Source: API request Project Steps: Data Capture: Upon receiving a API request, Pipedream will extract the following information: Order number Customer name Email address Order date Mobile number Pickup address Drop address Google Sheet Integration: The captured data will be automatically stored in a designated Google Sheet for record-keeping and future reference. Multi-Channel User Confirmation: SMS Notification: Pipedream will trigger an SMS confirmation using and , notifying the customer about their order details. WhatsApp Notification (Official API): will be integrated to send a WhatsApp

I'm seeking a proficient developer to create a new Revit plug-in that automates certain tasks. The primary objectives of this plug-in will be: - Adding safety alerts, specifically focused on fall protection and hazardous materials, in order to maintain robust safety standards. - Generating comprehensive reports derived from these safety alerts and other relevant data. If you have experience in software development, specifically with Revit and plug-in creation, your skill set may align perfectly with my project requirements. Familiarity with automated alert systems and report generation will be advantageous, as will a good understanding of construction safety protocols.

I'm looking for a Ph.D.-level researcher interested in image processing. You will find and summarize code repositories on a given topic.

...Jdime merge tool to resolve merge conflicts in my Java code. The ideal freelancer would have: - Proficiency in Java programming language - Hands-on experience with Jdime - Ability to quickly resolve merge conflicts in Java code I am looking for a smooth and automated merging process, which ultimately eradicates coding discrepancies. Proper communication and coding knowledge are necessary in order to effectively address and solve these types of conflicts. Note: I have written Java code. This code uses (the Jdime tool) to merge two versions and then report the results. If Jaime successfully combines these two versions, however When we executed the code, it showed that all the conflicts that we provided are not margable by Jdime, I am not confident in these results that is w...

For the new version of an existing application, we have 4 XD projects with different scenarios with desktop and mobile version that need to be transformed into XHTML. Here are some details: - we want responsive pages - no javascript except if it comes from bootstrap - please note that the top bar is almost always the same, it must be the same XHTML code - there is a breadcrumb trail that changes color as you progress Desktop version : The 1st project () and 2nd project () are almost the same except for the beginning. The 1st is an account creation. The 2nd is when the user already has an account. for the 1st XD project : - page 1 ignore this - page 2 account creation for the 2nd XD project : - page 1 ignore this 1st project and 2nd project : - (1st project after account creation) page ...

Hello, The following checkout page has been created by another dev using a woocommerce plugin The current ...following checkout page has been created by another dev using a woocommerce plugin The current plugin uses Attributes and Variations to identify the right product, but I need to have multiple individual products on woocommerce. I want to modify the existing plugin or create a new one in such a way that when a product is chosen on the front end, the relevant product is sold on the backend woocommerce products. The design has to be modified a bit too in order to match the homepage. Also, required is the Payment integration. My max budget for this gig is $50, any quote above that will be completely ignored. Thanks.

I am seeking a capable sales agent who boasts a wealth of experience in the technology sector. Your task will primarily be focused on expanding our reach and driving sales in key markets within Europe. Key Skills and Experience: - Extensive knowledge and experience in the tech industry - Track record of driving sales in the European market - Fluency in English is a must in order to effectively communicate our brand message and product information Ideal candidates should be result-oriented, customer-focused, and demonstrate an in-depth understanding of the European technology market. They should also have strong communication skills and be able to strategize and execute effective sales methods. Fluent English speaking ability will also be vital in ensuring smooth conversation with...

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More details: Is this project for business or personal use? This question was skipped by the user What information should successful freelancers include in their application? Past work How soon do you need your project completed? ASAP

...build an Automatic Speech Recognition (ASR) and Text to Speech (TTS) system that specifically caters to the Sorani Kurdish dialect. The primary goal of this project is to convert spoken Kurdish into written text to be utilized for voice commands and control. I am looking for a person to design a project (Automatic Speech Recognition (ASR), Text to Speech (TTS)(Text to Speech (TTS) and Speech to Text) by Kurdish Key Responsibilities: - Develop an ASR system capable of accurately transcribing Sorani Kurdish - Implement a Text to Speech (TTS) feature enabling the system to speak back in Kurdish - Ensure the system supports voice commands and control, enhancing its usability Ideal Candidates: - Experienced in speech processing and recognition technolog...

I need a skilled freelancer to design a PowerPoint presentation, to be used as a sales pitch for a new chapter. ...skilled freelancer to design a PowerPoint presentation, to be used as a sales pitch for a new chapter. The main focus of the content will be on chapter creation, purpose, strategy, and timeline Key Requirements: - Prior experience in designing presentations - Strong understanding of how to visualize and present data - Ability to influence potential buyers through compelling visuals - No need to create an additional chapter Your strength in translating business data into compelling visuals will notably increase your chances of securing this project. Creativity, attention to detail, and understanding of the sales process are equally important. Let's help lure thos...

Urgent! We need a skilled Figma designer to create a user-friendly betting app interface similar to Action Network. Experience with mobile app UI/UX design is crucial, and knowledge of betting app trends is a plus. Submit your portfolio and hourly rate for immediate consideration!

I'm looking for a talented system designer to help with the development of a product of mine. The project will involve the programming of a Graphic User Interface (GUI) for the product. As I don't have the required software tools yet, I am open to suggestions on which ones are best employed for this task. Furthermore, I need the system design to be supported on multiple platforms, including mobile and tablet. I need the system design to be able to make screenprints of the product. Im thinking a wordpress with facebook knowledge is what I need for programming. But I need to make it understandable for programmers. First I need to make my concept understandable visual. I explain and they make it visible...no confusion for programmers This is a website tha...

I need a veteran Python programmer who excels in mathematical analysis within Python. This project will be undertaken on the Jupyter Notebook platform. You will be tasked with a critical project focusing on arc diagrams, namely: - Analysis, debugging, and explanation of code related to these diagrams. - Performing both theoretical and mathematical algorithmic analysis on arc diagrams - Writing and implementing code that's capable of counting specific types of arc diagrams - Modification of arc diagrams which are tied down by specific constraints My project requires a seasoned expert with: - Experience and fluency in Python programming. - Strong background in mathematical analysis, and able to demonstrate this in the Python language - Proven track record or similar; experience in wr...

Directions are provided sequentially in order of proximity based on your location. If you specify 5 places to visit, 1,2,3,4,5~ Directions: Sequential execution guidance Places visited Memo function Search results Places to visit are marked in blue Pending Yellow Red Visit Completed Select 3 colors to indicate whether a place has been visited or not Directions to unvisited places Map API provided by Korea connection join the membership Service available to members Unavailable Administrator Member Options It's a very simple service. Search for a restaurant on the map When dozens of restaurants appear, select the one you visited among them. When you visit a store with directions, leave a store note Only you can see the notes Web mobile version development

...experienced developer to create an advanced price monitoring/alert system that targets Amazon, via the Keepa API Key Requirements include: - Ability to monitor price changes across a broad range of products, with specificity in certain sectors not being prioritized. - Automatic alert system for price changes. Frequency of alerts is to be confirmed, as this feature needs to be customizable. - Highly preferred for the system to be capable of tracking a variety of product categories such as Electronics, Fashion and Home Appliances. Ideal Candidate should possess: - Proficiency in Amazon's API (and Keepa API) and other relevant Web Scraping tools. - Previous Experience in developing price comparison or price monitoring tools. - Strong understanding ...

...competent Android developer to build "TaskMinder," a task reminder application. The app will need to implement the following key features: - Allow users to input a task name and number - Provide two radio buttons for the user to select task branch, the tasks reminders over the 90 day cycle are predefined and based on which of the two radio buttons that was selected. The tasks occur in a non changing order, a set number with titles, for radio button 1 and a different task number with titles for radio button 2 if selected. Two different branches of tasks depending on which radio button was selected. - An interactive drop-down menu that offers options dependent on the selected radio button. The options should be Do this step today, in sequenc, based on predefined finite n...

I am seeking a skilled developer to integrate my Odoo 17 system with WhatsApp for my business. The project is aimed at automating order updates and improving response time, among other benefits. Key Aspects: - Customer Notifications: The integration should enable automated notifications to customers about their orders. - Automated Messages: The system should be able to send out status updates and other relevant information automatically. - Two-way Communication: It is important that the integration allows for both sending out information and receiving responses from customers. The integration is expected to have a significant impact on our business processes by helping with: - Automating Order Updates: This will not only save time but also improve the accuracy...

...for a freelancer who can build a robust document management system for my organization. The system should be able to handle a high volume of users, over 50. It will primarily be used for managing text documents, so having a strong foundation for handling this type of content is critical. Key Features: - File Management: The system should have powerful storage and organization capabilities. This will allow users to easily store, retrieve, and organize their documents. - Version Control: It's important that the system provides version control for the documents. This feature will help in keeping track of changes made to the documents and retrieving previous versions if needed. - Access Control: Security is paramount. The system should have a r...

Good day, We please need a Freelancer to create a WebM video from an existing and purchased Premiere Pro template. This is the template: The requirements to the output video are: - Put below mentioned sequences 01-03 into a row - Video will be displayed in this frame (check ) - Video must be in WebM format - Video background must be transparent (!!) - Video must be web-optimized - Video must run in a loop - Video must contain transparent gradient on left/right side - Video sequence 03 must contain transition animation Please check the individual sequences for more details: Sequence 01 - Smartphone - Take animation from 00:09 - 00:15 - Take screenshot

Hi Are you looking for an assistant to do USA, Europe supplier research? I am a well experienced business & market researcher. I will find, analyse, collect and research Market data and information for your business. Target Markets: I will provide you services for product develop...analysis Brand Research Product Research Lead generation Linkedin Research and Web Research Contact information Research Contact list building etc. The pricing will depend on the nature of the work, deliverable and the information that you require. The Market data and information provided will be obtained from online, observation, calls, walk-in enquirers and emails. Message me before placing an order for further information to discuss more about your project, time frame and budgets. Thank you. r...

I am searching for an experienced developer to create a robust loans management system that caters to three types of users: administrators, loan officers, and customers. Key skills and experience necessary for this complex project includes programming, software development, finance, and a strong understanding of loans systems. The ideal loans management system must include: • Loan Application Tracking: Ability to record and track the status of loan applications. • Loan Approval Process: A systematic method of validating and approving or denying loan applications. • Loan Disbursement Tracking: Functionality that records and monitors the distribution of approved loans. In terms of user roles, the system must seamlessly cater for three types: ...

I am in search of a proficient developer to create a USSD solution compatible with any network operator, beyond just MTN, Airtel, and Vodafone. The system should enable loan application, loan repayment, and account balance enquiry efficiently. Ideal Skills and Experience: - Extensive experience working with multi-network compatible USSD solutions. - Understanding and practical knowledge of financial systems, especially loan management. - Clear and demonstrated understanding of USSD technology. Application Requirements: Interested freelancers should include the following information in their application: - Proven experience in the field. - Examples of similar projects (if any). - A proposal detailing how they plan to address this project, as well as a tentative timeline ...

Postgres data query system Docker across multiple servers

Good day, We please need a Freelancer to create a WebM video from an existing and purchased Premiere Pro template. This is the template: The requirements to the output video are: - Put below mentioned sequences 01-03 into a row - Video will be displayed in this frame (check ) - Video must be in WebM format - Video background must be transparent (!!) - Video must be web-optimized - Video must run in a loop - Video must contain transparent gradient on left/right side - Video sequence 03 must contain transition animation Please check the individual sequences for more details: Sequence 01 - Smartphone - Take animation from 00:09 - 00:15 - Take screenshot

I'm seeking a NodeMCU expert to assist me in building a system for monitoring water pH. This system will involve retrieving data from a NodeMCU and storing it on Firebase. Key Project Details: - Retrieve Water pH: The primary goal of this project is to measure and store the water pH value. - Rough Estimate: I only need a rough estimate of the water pH level. High precision is not required. - Firebase Storage: The data collected should be stored on a Firebase database. Ideal Candidate Skills: - Proficiency in NodeMCU programming. - Experience with data transmission to Firebase. - Previous work with pH sensors is a plus. Upon completion, I would like to be able to monitor the water pH in real-time via a dashboard linked to Firebase. The dashboard should be user-friendl...

I'm developing an open source WBO whiteboard: In order to optimize better pen writing I want to implement a smooth SVG freehand drawn path in real time. The following code snippet makes the curve smoother by calculating the average of the last mouse positions. The level of smoothing depends on the size of the buffer in which these values ​​are kept. Please look at the example I have attached. Here is the link to the code snippet Please bid only experts. My requests is: Adapt this code to WBO so that the writing quality is as in this code snippet.

I'm seeking a professional who can effectively convert my Google document into a Word file while ensuring all crucial formatting elements such as font styles, headers, footers, and bulleted or numbered lists remain intact. It's not just a simple copy-paste task; it requires creating a whole new version in Word format. In order to get this job done, you should have: - A keen eye for detail to maintain accuracy throughout the conversion - Proficiency in Google Docs and MS Word environments - Excellent understanding of document formatting elements Freelancers interested in this project need to provide detailed project proposals, outlining their approach to executing the task, anticipated challenges, and strategies to overcome potential issues. Beyond the conversion, it ma...

...output image of the size of 1x(N+1). The image encodes as the first pixel the color of the background. Then it should encode "the color hierarchy" of all the N colors used to subdivide the patches of land. The hierarchy is defined by "visiting" first in depth the upper left patch, then upper right patch, then lower left, and lower right. The colors should be stored in reverse order with respect to the "visit" made. With reference to the previous semplified case, assuming a boundary color is described with a letter, the output image should contain: out_colors = bg b c a Another case a bit more complex: +++++++++++++++++++++++++++++++++++++ +-1-|-2-|---------|--------|--------+ ...

As the owner of a WooCommerce site, I'm experiencing an issue where my site fails to send out order confirmation emails. Interestingly, I'm currently not utilizing any email service provider for my site. Equally important to note, I haven't spotted any error messages related to email sending on my platform. I'm seeking assistance from a skilled WooCommerce specialist, preferably with a rigorous understanding of WordPress and email functionality, to diagnose and rectify this problem speedily. Your responsibilities will include: - Diagnosing the reason why order confirmation emails aren't being sent - Proposing an appropriate solution, such as integrating an email service provider, if necessary - Implementing this solution and ensuring its effective...

I'm looking for a skilled PHP developer who can create a secure login and register system using fingerprint data stored in a MySQL database. The system must ensure seamless user experience, while maintaining strong security measures to protect sensitive data. Key Features: - Implementation of a biometric device for fingerprint data collection - Two-factor authentication to enhance the system's security - Support for multiple user roles with distinct permissions Ideal Skills and Experience: - Proficient in PHP programming language - Experience in MySQL database management - Strong understanding of data security principles and practices - Prior experience in implementing biometric systems would be advantageous - Excellent problem-solving and communication ski...

As the owner of a web-based platform, I've encountered a troublesome problem concerning Google Pay integration. Specifically, the issue lies within cryptography - however, the exact aspect of cryptography posing the problem remains unclear due to lack of further information. Therefore, I need an expert who possesses a deep understanding of payment processing systems, particularly Google Pay, and who is proficient with cryptographic systems on the web platform. Your tasks will include the following, depending on the discovered problem: - Debugging and resolving encryption problems - Sorting out decryption issues - Overcoming challenges related to key generation and management Despite the puzzle-like nature of the job, a meticulous and patient troubleshooter with strong expe...

I'm looking for a skilled designer who can make a few simple changes to my banner. - The primary task is adjusting the size of the banner to better fit my needs. - I also need some text modification done on the banner. Please note that the specifics of the text modification were not mentioned, so you may need to be flexible and have a good eye for design in order to make the banner look visually appealing. Skills: Graphic Design, Adobe Photoshop/Illustrator, attention to detail.

...the interface. - Error Handling: - The software should handle errors gracefully, providing meaningful error messages to the user in case of file upload failure or data extraction issues. 4. *Non-functional Requirements:* - Performance: - The software should process DWG files efficiently, minimizing processing time and resource consumption. - Scalability: - The system should be scalable to handle a large number of concurrent file uploads and processing requests. - Compatibility: - The software should be compatible with major web browsers. 5. *Constraints:* - The software must comply with legal requirements regarding the use and distribution of DWG file parsing libraries or tools. - Compatibility with different versions ...

Hi Aravind A., I noticed your profile and would like to offer you my project. We can discuss any details over chat.

...control system, I am looking for a skilled freelancer to design and implement a system that will help me effectively manage my inventory. The system will need to be developed from scratch as it does not need to integrate with any existing software or systems. Key Features: - Real-time Inventory Tracking: The system should allow me to track inventory levels in real-time to prevent stockouts and overstocking. - Reporting and Analytics: An essential feature of the system should be the ability to generate detailed reports and analytics. This will help me make data-driven decisions to optimize my inventory management processes. Ideal Skills: - Extensive experience in designing and developing inventory control systems, particularly barcode-based. - Profici...

Für ein großes deutsches Industrieunternehmen (DAX) suchen wir für ein langjähriges CRM Projekt einen Teilprojektleiter für den Integration Workstream. Der Projektleiter treibt Themen eigenverantwortlich an und koordiniert die technische Abstimmung zwischen den beteiligten System und Architekten. Für technische Fragestellungen wird er durch das Entwickler-Team des Kunden bzw. des Implementierungspartners unterstützt. Weitere Voraussetzungen: Sprachkenntnisse: - Deutsch: Muttersprachenniveau - Englisch: Sehr gut Umfang: ab sofort bis 31.12.2024, Vollzeit, 40 Std. pro Woche 100% Remote

I'm looking for a talented developer to create an interactive D3 tree for showcasing a family tree. This is a unique project, and I need someone with experience in D3.js and working with large datasets. The main requirements are as follows: - Visualizing a family tree: The D3 tree should be able to display a large family tree with 100 generations. It should be easy to navigate and explore. - Experience with D3.js: I need someone with proven experience in D3.js and creating interactive data visualizations. - Handling large datasets: Given the size of the family tree, the project may require expertise in handling, processing, and visualizing large datasets efficiently. Current website: the design theme is completed, the website has some features already designed, some ...

I am in need of a freelancer who can calculate the geographic distances between two company headquarters, a total of 1518 dyads. The headquarter location data I possessed were sourced from Crunchbase. Most companies are located in the US but not all. For most companies I have postal code data but for some I only have ...computing geographic distances. Specifics of what I need: - Use postal codes of each pair of companies' headquarters to compute the distance - Distance should be presented in kilometers - Only numeric values of the distances are required, no maps or graphs Ideal candidates should have experience in data analysis and programming. It would be a plus if you've worked on similar projects before, in order to give numeric representation of geographic distances...

...adapt well to various screen sizes on Android and iOS mobile devices, both smartphones and tablets. 4. System Integration a. The application must be able to integrate with existing systems at [redacted] such as Single Sign-On (SSO) and Document Management System. 5. Security and Privacy a. The application must comply with ISO 27001:2022 security standards and ensure data security when transmitted and stored. b. User authentication and access authorization must be implemented to ensure that only authorized users can access sensitive information. 6. Performance and Efficiency a. The application must have fast and responsive performance, especially in loading AR visualization data and processing equipment information in real-time. b. Performance optimization for v...

...enthusiast, I'm looking for a skilled WordPress developer to create a bespoke order plugin for my academic website. The form should have a similar flow to the one found on , with a step by step format and a progress bar, ensuring a clear and user-friendly experience for my customers. Key Features and Customization: - Developing a custom order form: The plugin should be able to collect essential information necessary for the service I provide. - Interfacing with Payment Gateways: I need the plugin to integrate PayPal, Google Pay and Flutter Pay for card payment processing. - Step-by-Step Flow: The plugin should guide users through the order process with a progress bar, mirroring the flow of the form. Ideal Skills and Experience: - Proficient in ...

? Company Description: We are a dynamic tech company focused on integrating AI-driven communication solutions across platforms such as WhatsA...Continuously test and optimize prompts to improve interaction quality and user satisfaction. - Stay updated with the latest developments in AI and conversational design to implement cutting-edge solutions. ? Requirements: - Proven experience in conversational AI and prompt engineering, preferably with OpenAI's Assistant API. - Strong understanding of natural language processing and AI communication principles. - Ability to create detailed, effective prompts from complex client briefs. - Excellent problem-solving skills and creativity in designing conversational flows. - Ability to handle multiple projects simultaneously in a f...

Project Overview: We are looking to create a dynamic promotional video for 'Pizzone', an innovative HORECA app designed to streamline the supply process for bars and restaurants, allowing them to order beverages and food online. The video should capture the ease and efficiency of using Pizzone, emphasizing its functionality and benefits to potential users. Objective: The main goal of the video is to illustrate how 'Pizzone' simplifies the ordering process, saves time, and offers a wide range of products, including alcoholic beverages. The video should engage potential users and encourage them to download and use the app. Target Audience: Our primary audience includes owners and managers of bars, restaurants, and other hospitality venues looking for a con...

I'm currently facing a critical issue with my Ionic application across both iOS and Android platforms. The problem lies in the Apple Pay payment processing through Stripe. The core problem is that payments are not processing as expected. Key Requirements: - Resolve payment processing issue with Apple Pay on both iOS and Android - Troubleshoot and fix underlying issues that cause the payment failures Skills Needed: - Strong experience with Ionic, especially Ionic 5 or above - Expertise in Apple Pay integration - Proficiency in Stripe payment gateway - Skilled in debugging and troubleshooting complex payment issues This project requires someone who is not only well-versed with the technicalities of Ionic and payment gateways, but also has a good understanding of ...