feat(payments): implement idempotency keys for payments - #77
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Co-authored-by: enny791 <enny791@github.com>
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This PR introduces idempotency key support to the SEP-24 withdrawal initiation endpoints to prevent duplicate charges or conflicting state mutations during network retries or timeouts.
We have added an in-memory \idempotencyCache\ to the \SEP24SettlementService\ that intercepts incoming requests containing the \Idempotency-Key\ header and returns the cached response if it has already been processed successfully.
Closes #47.