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](/developers/api-reference/moneyin/capture-an-authorized-transaction).
Only card transactions can be authorized. This endpoint can't be used for ACH transactions.
<Tip>
Consider migrating to the [v2 Authorize endpoint](/developers/api-reference/moneyinV2/authorize-a-transaction) to take advantage of unified response codes and improved response consistency.
</Tip>