Problem

Tron same-chain payment support is being added to the Request API, but there is no documentation for developers on how to use it.

Proposed Solution

Document Tron same-chain payment support including:

• Supported tokens (USDT only for MVP)
• Limitations:
  • No cross-chain payments (LiFi doesn't support Tron)
  • USD-denominated invoices only (no Euro due to USDT regulations)
  • 1:1 USD/USDT conversion assumption (no price feeds)
• Integration examples and code snippets
• API endpoint usage for Tron payments

Considerations

• Must align with final API implementation in request-api #432
• Should be drafted alongside development, finalized after API is live
• Consider adding a "beta" or "experimental" label until fully validated