The Carrier Billing Refund API is used by merchants that implement Direct Carrier Billing as a payment method. All use cases require the existence of a previous purchase using a Carrier Billing service, so there must be an identifier for the previous purchase transaction, to which the refund is linked:

• Request for a total or partial refund of a purchase due to the return of the product or service. The conditions for accepting and processing the refund are subject to the specific conditions of each merchant.
• Request for a refund due to erroneous or improper charges.

• Transparency for the end user. The API allows the merchant to manage the refund with the operator directly or through a payment aggregator. The buyer keeps the merchant as a point of contact for the refund claim.
• Uniform interface for merchants and aggregators. The implementation of the CAMARA API by operators allows reducing friction in the integration of merchants and aggregators, since they can use the same integration.
• The API allows for a high degree of flexibility and granularity in terms of the structure of amounts returned per item, taxes, etc.