how to ensure my pos system only print one copy

Hello! I am a web developer. I have checked your project description. I can build it If you hire me, I am gonna do my best for our project. I guarantee the good result. I will wait for your reply. Thank you.

Hi, How are you? Hope you are going well! I checked your project carefully, so that i feel very confident in your project because I am talented web and mobile app developer with 6 years experiences. If you give me all data for the project, I will start working immediately. Also if you want, i will show you my previous projects. I think that you will be get "Best Result" with my working. i would like to discuss about the project over chat. I am waiting for your response. Best regards.

Hi, I have checked your requirements and very interested in your project. I have rich of Mobile app development for over 5 years. *** Here are my experienced section *** Social SDKs(Facebook, Twitter, Admob, Google APIs and all other sections of Social) MySQL, PHP, JSON, UI/UX Adobe photoshop *** I guarantee you *** Good relationship Strong skills of mobile app design and development High Quality, Exact Deadline Fluent English, Full time communication 40 + hours per week I hope to work with you for long term and have good relationship. I believe communication is key for successful project. Looking forward to hearing you and start a LONG TERM RELATIONSHIP. Regards

I can help you with your printing issue and also I can contribute to your POS system as I am having 5+ yrs of experience inventory management system.