Authorizing a Payment with American Express Using Merchant Decryption Method {#samsungpay-auth-merchant-amex-intro}
===================================================================================================================

This section provides the following information:

* [Required Fields for Authorizing a Payment Using American Express and the Merchant Decryption Method](/docs/cybs/en-us/samsung-pay/developer/amexdirect/rest/samsungpay/samsungpay-services/samsungpay-auth-intro/samsungpay-auth-merchant-amex-intro/samsungpay-auth-merdecypt-amex-mandatory.md "")
* [Authorizing a Payment](/docs/cybs/en-us/samsung-pay/developer/amexdirect/rest/samsungpay/samsungpay-services/samsungpay-auth-intro/samsungpay-auth-cybs-amex-intro/samsungpay-auth-procedure.md "")
* [Example: Merchant Decryption with American Express Using the REST API](/docs/cybs/en-us/samsung-pay/developer/amexdirect/rest/samsungpay/samsungpay-services/samsungpay-auth-intro/samsungpay-auth-merchant-amex-intro/samsungpay-auth-merdecrypt-ex-amex-rest.md "")
  {#samsungpay-auth-merchant-amex-intro_ul_pcj_krp_npb}