Hi there, JakovCGN! Thanks for reaching out to Apple Support Communities.
After reviewing your post, it sounds like you are running into some issues sending money through Messages. We definitely understand that not having access to that handy feature would be a concern and we'd love to help. Let’s start by reviewing this article: Send and receive money with Apple Pay.
If you are not able to send money as expected, please check the requirements for this feature and make sure all are met. "You and the person that you're sending money to or receiving the money from must:
Please let us know if you have follow-up questions about this issue, or if the issue remains unresolved. Have a great day!