#153 Contract: Implement Payment Batching Contract

[olaayoade27-coder]

pr closes #153

Summary

Implements the Payment Batching Contract for issue #153.

Changes

• contracts/payment-batch/Cargo.toml — new crate definition
• contracts/payment-batch/src/lib.rs — contract implementation
• contracts/payment-batch/src/test.rs — test suite

Acceptance Criteria Met

• ✅ Supports batching up to 10 payments per transaction (MAX_BATCH_SIZE = 10)
• ✅ Partial failure handling — each payment uses try_transfer, failures don't abort
  the batch
• ✅ Gas optimized — no panics/rollbacks mid-batch, minimal allocations
• ✅ Event emitted for every payment (success or failure) via batchpay event

Tests

• test_batch_payments_success_and_event_emission — verifies successful batch and
  event count
• test_batch_payment_partial_failure — verifies failed payments don't block others
• test_batch_size_limit — verifies rejection when batch exceeds 10

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[ONEONUORA]

@olaayoade27-coder Pls stick to your issue description
Implement only the payment batching contract

[ONEONUORA]

@olaayoade27-coder Update on this issue

[olaayoade27-coder]

@ONEONUORA update has been made please confirm

[ONEONUORA]

@olaayoade27-coder
Pls why deleting 9025 lines of code
Your implementation does not require you to modified 323 files
Pls work on only your issues description

Sync with main branch before solving the issue
Read your issue description properly

[olaayoade27-coder]

@ONEONUORA please i have made an update on this like you told me to confirm its all done