Required Fields for Authorizing a Payment Using American Express and the Merchant Decryption Method {#samsungpay-auth-merdecypt-amex-mandatory}
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The following fields are required when submitting an authorization request using the Merchant decryption method:

* ccAuthService_cavv-set this field to the 3-D Secure cryptogram of the payment network token. Include the whole 20-byte cryptogram in the cavv field. For a 40-byte cryptogram, split the cryptogram into two 20-byte binary values (block A and block B). Set the cavv field to the block A value and set the xid field to the block B value.
* card_accountNumber-set this field to the payment network token value.
* card_expirationMonth-set this field to the payment network token expiration month value.
* card_expirationYear-set this field to the payment network token expiration year value.
* ccAuthService_commerceIndicator-set this field to `aesk`.
* ccAuthService_networkTokenCryptogram-set this field to the network token cryptogram.
* paymentNetworkToken_transactionType-set this field to `1`.
* paymentSolution-set this field to `008`.

Related Information {#samsungpay-auth-merdecypt-amex-mandatory_section_abb_khn_b1c}
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[Simple Order API Field Reference Guide](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/api-fields-so-intro.md "")