Modify an iMessage iOS Sticker app

I have an iOS iMessage app that I bought from a marketplace site where you can buy source codes. Apple rejected the app (see the attached screenshot "[login to view URL]"). The app is a stickers app for iMessage, with a parent app. I want to edit both, and add some features. The app has free stickers, and premium stickers that can be bought with IAP subscription. Monthly or Yearly. You can download the original app here. It's 100% equal to this. [login to view URL] I'm looking for a person who can help me changing and/or adding a few things in the app: In the iMessage extension: - Add a menu (like the "[login to view URL]") with an icon for "Recent Used" Stickers, another icon to return to the normal view. If you have more suggestions for the menu and you can do them just let me know. This will be taken into account when selecting the candidate. - When an user that has the app installed sends an sticker to other user that doesn't have the app installed. I want that if the user that receive the sticker clicks on the sticker, be sent to the page to download the app. (I'm not sure if this option is already in the app, you will have to check it). - In the "free stickers" there is a space where the stickers do not appear (below), and also the stickers are cut at the top. These two things must be corrected. See attached "[login to view URL]". They should appear as in the image, on the right side. Parent app: - I want to change all the parent app. It should have, at least, the same things (Rate Us button, How to install section with a video if possible (I will provide the video) or with images, More Info button with the Sticker Subscription info, Terms of Use button and Privacy Policy button) - I want you to redo it from scratch and with different design style. Maybe with a menu at the bottom? This will be taken into account when selecting the candidate. You can send me examples or tell me what you can do. Send me your suggestions. - I will provide the assets, buttons, texts for the Privacy Policy, Terms of Use, Sticker Subscription info, and the video/screenshots for the "how to install" section. If you have made similar apps you can send me screenshots or download link to check them. I'm open to hear if you have any suggestions/features for the app. IMPORTANT: I want the developer to be able to help me until Apple approve the app. Also update the app to be 100% compatible with iOS 12.