Authorize transaction
Authorize a card transaction. This returns an authorization code and reserves funds for the merchant. Authorized transactions aren't flagged for settlement until captured. This is the v2 version of the `api/MoneyIn/authorize` endpoint, and returns the unified response format. See [Pay In unified response codes reference](/developers/references/pay-in-unified-response-codes) for more information.
**Note**: Only card transactions can be authorized. This endpoint can't be used for ACH transactions.