Implement Transaction Submission Service

[ayshadogo]

Description:
Create service to submit signed transactions to Stellar network.

Tasks:

• Create transaction submission service
• Submit transaction to Horizon API
• Handle submission responses (success/failure)
• Extract transaction hash from response
• Handle transaction errors (insufficient funds, invalid sequence)
• Implement retry logic for network errors
• Add submission timeout handling
• Log submission attempts and results
• Return transaction hash to caller
• Handle duplicate transaction submissions

Acceptance Criteria:

• Transactions submit successfully to network
• Transaction hash returned on success
• Errors are categorized and handled
• Retries work for transient failures
• No duplicate submissions occur

Common Errors:

• tx_insufficient_balance: Donor lacks funds
• tx_bad_seq: Sequence number mismatch (retry)
• tx_timeout: Transaction took too long

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[drips-wave]

This issue has been added to the Stellar Wave Program and is worth 200 Points.

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[0xNgoo]

@0xNgoo has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi Team,

I'll implement the transaction submission service for StellarAid, focusing on robust Horizon API integration. I’ll develop the submission logic to handle success/failure states, extract transaction hashes, and implement specific error handling for tx_insufficient_balance and tx_bad_seq with automated retry logic. I'll also include deduplication checks and timeout handling to ensure reliable network broadcast.

ETA: 5 hours

ℹ️ Repo Maintainers: To accept this application, review their application or assign @0xNgoo to this issue.