feat(backend): introduce transaction submission abstraction#73
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greatest0fallt1me merged 2 commits intoStreampay-Org:mainfrom Apr 1, 2026
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Body: - add transaction submission service for Horizon/RPC flows - support external_signer and backend_sign modes - enforce signer env trust model (dev seed only, KMS required in non-dev backend signing) - add mocked tests for success and failure paths (including redaction) - document signer modes and security model in README
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Pull Request: Add Horizon/RPC Transaction Submission Service
Implements transaction submission service as specified in #18.
Changes
TransactionService: Build, sign, and submit transactions to Horizon/RPCbackend_sign(dev only) andexternal_signer(production)Security
Test Coverage: 97.3%
Closes #18