The official api for iMessage is far richer than this and has things like forms, quick replies, various pickers, apps you can send in addition to text and images

Part of that is agreeing not to spam people and making it very clear you are legitimate business that is easy to contact.

Thanks for the suggestion! Yes, the setup process is extremely long and requires a lot of documents from the side of the business haha. It's definitely one of our goals to create the Vercel for iMessage for Business. Also, for the iMessage app payloads, that's an awesome suggestion! We can work on building that.