Recurrence Identifier Field. Size: 36.

Store identifier in API E-commerce Cielo. Size: 36. This documentation provides a default MerchantId to allow testing in the sandbox, but you can also provide the enabled MerchantId during the deployment process.

Public Key for Double Authentication in API E-commerce Cielo. Size: 40. This documentation provides a default MerchantKey to allow testing in the sandbox, but you can also provide the enabled MerchantKey during the deployment process.

Request Identifier, used when the merchant uses different servers for each GET/POST/PUT. Size: 36.