docs: Credit account postman collections and initial sequence diagrams

[john-fletcher-aot]

Description

Credit account postman collections and initial sequence diagrams

Fixes # ORV2-1935 (partial), ORV2-2056 (partial)

Type of change

• Documentation update

How Has This Been Tested?

N/A

Checklist

• I have read the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (N/A)
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

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[erikataot]

approved but I really detest spaces in filenames.