# Risk Custom Data
source: https://developer.mastercard.com/mastercard-gateway/documentation/gateway-features/data-and-reporting/supp-data/risk-custom-data/index.md

The API allows you to pass additional data in transactions. It may include industry data relating to airline, healthcare, or data related to the transaction (Internet, order, or even custom data). The supplementary data that you pass for a transaction is stored on the Mastercard Gateway against that transaction.
Warning: Contact your payment service provider to check if providing such data is supported for your acquirer. The transaction Operations that support the data, and the mandatory data fields required to process the transaction depend on your acquirer.

Risk custom data includes any additional information requested by third-party risk assessment providers which cannot be passed using other available data fields. The names of the risk custom fields must be entered as agreed with your third-party risk assessment provider. Risk custom data fields are returned in the response and can be used for reporting and analysis purposes as required. Sensitive data must not be included in any of the risk custom data fields.

Risk custom data applies to Authorize, Capture, Pay, Verify Operations.
**Acquirer Custom Data API Reference** [\[REST\]](https://developer.mastercard.com/mastercard-gateway/documentation/api-reference/v100/rest/api-ops/index.md#transaction.md) [\[NVP\]](https://developer.mastercard.com/mastercard-gateway/documentation/api-reference/v100/nvp/api-ops/index.md#transaction.md)