Required Fields for Processing an Authorization with Mastercard Expert Monitoring Solutions {#payments-mc-ems-required}
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Use these required fields to process an authorization using Mastercard Expert Monitoring Solutions.

> When relaxed requirements for address data and the expiration date are being used, not all fields in this list are required. It is your responsibility to determine whether your account is enabled to use this feature and which fields are required. For details about relaxed requirements, see [Relaxed Requirements for Address Data and Expiration Date in a Payment](/docs/cybs/en-us/payments/developer/ctv/so/payments/payments-relax-reqs.md "").

billTo_city
:

billTo_country
:

billTo_email
:

billTo_firstName
:

billTo_lastName
:

billTo_postalCode
:

billTo_state
:

billTo_street1
:

card_accountNumber
:

card_expirationMonth
:

card_expirationYear
:

ccAuthService_run
:
Set the value to `true`.

merchantID
:

merchantReferenceCode
:

purchaseTotals_currency
:

purchaseTotals_grandTotalAmount
: