Execute Payout

Executes payout with confirmed amount from a pending transaction. **Authentication:** - **REQUIRED**: Basic Auth only. Body-based credentials are deprecated and not supported. **Key requirements:** - `customer_id` is **required** and must: - be provided in request body, - not contain `/`, - exist under your account's `registered_customers`, and - match the `customer_id` bound to the transaction. - Sender profile for execute is sourced from the registered customer record. **You do not need to send** **`sender`** **in executePayout.** **Flow:** 1. **X-Idempotency-Key** header is required (unique per logical payout). 2. **HMAC (when configured):** If your account has `signing_secret`, send HMAC-SHA256 over JSON body (excluding `signature`) via `X-Signature` or body `signature`. 3. If idempotency key already has a successful stored 202 response, that response is replayed (with ownership/customer validation). 4. Loads transaction, validates account ownership, `customer_id` ownership, and **PENDING** status. 5. **Amount/currency lock:** if transaction already has saved amount/currency, `amount_confirmed` and `currency` must match exactly. 6. **partner_transaction_id:** can be set once if empty; otherwise must be omitted or the same value. 7. Validates required fields from `missing_fields` 8. API returns **202 Accepted** (with status `PROCESSING`). Final status is completed by provider/webhook updates. **Request body:** - Required: `tx_id`, `customer_id`, `amount_confirmed`, `currency` - Optional: `partner_transaction_id` - `sender` is not required for execute (derived from registered customer profile). **Response (202 Accepted):** - `status`, `tx_id`, `customer_id`, `message`, `exchange_rate`, `fee`, `percentage_fee`, `fixed_fee`, `amount`, `amount_usd`, `currency` - Optional: `recipient`, `partner_transaction_id`, `updated_at` **Precision:** - `exchange_rate`: **10** decimal places - USD fields (`fee`, `percentage_fee`, `fixed_fee`, `amount_usd`): **2** decimal places **Error:** - Returns 404 if `customer_id` is not found under your account. - Returns 403 when transaction ownership does not match account/customer.