Validation should be applied to all apis given to us, not just one api

I created another new one, here it says "debitBranchCode": "00777" and "receiverCode": "059" and the response says success, but such Bank does not exist. This is a very bad and big mistake.
Validation should be applied to all APIs given to us, not just one API.

2.

The second drawback.
Here we use the 4.2.1 API to see all the new K7artote7kas that appear when the client enters the mobile application.
If so, here are 2 field responses about Kartoteka. We need all information about this Kartoteka Please return all information.
Only Transaction number and amount are returned here