# Stage: Confirm Payment & Failure Handling

Upon the PMM's payment via `makePayment()`, including a `paymentTxId`, the trade enters the `CONFIRM_PAYMENT` phase. The `MPC`, acting as the payment verifier, must confirm the payment meets protocol specifications, checking amounts, destination chain, and `paymentTxId` accuracy.

### <mark style="color:orange;">Steps in This Phase</mark>

* **Successful Payment**: The `MPC` calls `confirmPayment()`, transitioning the trade to `CONFIRM_SETTLEMENT`, and emits a `PaymentConfirmed` event for traceability. Once confirmed, the payment is immutable.
* **Failed Payment**: If discrepancies like an incorrect amount or malformed `paymentTxId` occur, the trade moves to the `WARNING` stage. Here, the `PMM` can resubmit correct payments within the `scriptTimeout`.

### <mark style="color:orange;">Actionable Functions</mark>

* **confirmPayment()**

  ```solidity
  function confirmPayment(bytes32 tradeId, bytes calldata signature) external;
  ```

  * **Execution**: Through the `Router` by authorized `MPC Node`.
  * **Verification**: Ensures the trade is in the correct stage and within `scriptTimeout`.
  * **State Transition**: Advances trade to `CONFIRM_SETTLEMENT`, logs confirmed `paymentTxId`, and emits `PaymentConfirmed`.
* **report()**

  ```solidity
  function report(bytes32 tradeId, bytes calldata msgError, bytes calldata signature) external;
  ```

  * **Execution**: Through the `Router` by authorized `MPC Node`.
  * **Verification**: Ensures trade is not yet finalized.
  * **State Transition**: Logs failure, moves trade to `WARNING`, and emits `FailureReported`.

#### <mark style="color:orange;">Trade Data Query</mark>

* **On Success**: Access trade stages and finalization details through relevant view functions.

  ```solidity
  function getCurrentStage(bytes32 tradeId) external view returns (uint256);
  function getTradeFinalization(bytes32 tradeId) external view returns (TradeFinalization memory);
  ```
* **On Failure**: Retrieve error metadata with details for resolution.

  ```solidity
  function getCurrentStage(bytes32 tradeId) external view returns (uint256);
  function getFailureInfo(bytes32 tradeId) external view returns (FailureDetails memory);
  ```


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