Enable zero-amount validation for GCash on Adyen Integration v2.0 by enabling AUTHORISE_ZERO and setting the default authorization amount to 0 on the Adyen gateway instance.

1. Contact Adyen to enable AUTHORISE_ZERO.
2. To use zero-amount validation, set the default authorization amount to 0 on the Adyen gateway instance. No additional enablement from Adyen or Zuora is required. For more detailed information, see Configuration fields.