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

* descriptor-set this field under the fluidData object to `RklEPUNPTU1PTi5TQU1TVU5HLklOQVBQLlBBWU1FTlQ=`.
* processingInformation.commerceIndicator-set this field to `aesk`.
* paymentInformation.fluidData.value
  * Set the field to the value that was returned from Samsung Pay in the *3ds.data* block as follows:
    * Retrieve the payment data from Samsung Pay in JSON Web Encryption (JWE) format.
    * Encode it in Base64.
    * Add the value to the paymentInformation.fluidData.value field.
* paymentInformation.tokenizedCard.transactionType-set this field to `1`.
* processingInformation.paymentSolution-set this field to `008`.

Related Information
-------------------

[REST API Field Reference Guide](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/rest/api-fields/rest-api-fields-intro.md "")