Updates the expense details of a transaction. The identifier can be the card transaction ID (CTX-...) or its expense ID (EXP-...). Send only the fields you want to change.

Get valid IDs for each field from:

• category_identifier: List expense categories
• vendor_identifier: List accounting vendors
• tax_rate_identifier: List accounting tax rates
• expense_account_identifier: List accounting expense accounts
• payment_account_identifier: List accounting payment accounts

status is one of incomplete, pending_review, ready, or synced. If you don't send status, an incomplete expense moves to pending_review automatically once it's ready for review, for example when all required fields are filled.

The response is {"success": true} with the updated transaction in data, in the same shape as Fetch expense transaction details. An unknown or inactive identifier returns 422 with VALIDATION_ERROR; so does a vendor whose currency differs from the transaction's (Wafeq vendors are exempt).