Documentation: API.md does not document the sep7_uri field or SEP-0007 URI format

[henrypeters]

Category: Documentation - API Reference
Priority: Medium
Estimated Time: 1 hour

Description:
The sep7_uri field in PaymentRequestView (built in src/api/payment_requests.rs) is the SEP-0007 web+stellar:pay URI — the exact payload a frontend encodes into a QR code. This field is the core of the QR payment flow, yet API.md may not explain:

1. The exact URI format: web+stellar:pay?destination=...&amount=...&memo=...&memo_type=MEMO_TEXT
2. That sep7_uri is null for non-XLM assets (cNGN) with an explanation of why
3. That the amount in the URI is in XLM decimal notation (not stroops)
4. Which SEP-0007 fields are included and which optional ones are omitted

Tasks:

• Add a dedicated section in API.md explaining the sep7_uri field with a concrete example
• Document the null case for non-XLM assets
• Add a note about QR code generation
• Update openapi.yaml to document the nullable field with an example
• Cross-reference the SEP-0007 spec

[Oluwasegun6921]

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[JoyAdah]

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