Mypayment extended

[Rotheem]

Description

Please explain the changes you made here.

Checklist

• Created tests which fail without the change (if possible)
• All tests passing
• Extended the documentation, if necessary

[codecov]

Codecov Report

❌ Patch coverage is 70.95238% with 61 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
app/core/mypayment/endpoints_mypayment.py	59.70%	27 Missing ⚠️
app/core/mypayment/utils_mypayment.py	61.19%	26 Missing ⚠️
app/core/mypayment/cruds_mypayment.py	78.26%	5 Missing ⚠️
app/core/mypayment/exceptions_mypayment.py	72.72%	3 Missing ⚠️

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