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Required Fields for a Pre-Authorization {#sis-pymnt-svcs-cloud-pre-auth-api-reqfields}
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serialNumber
:
Set the value to the serial number of the terminal.

request.type
:
Set the value to `PaymentRequest`.

request.merchantReferenceCode
:
Set the value to a unique, user-defined reference code. The code can consist of up to 50 alphanumeric characters, underscores (_), and dashes (-).

request.amountDetails.amount
:
Set the value to the transaction amount.

request.amountDetails.currency
:
Set the value to the currency code.

request.capture
:
Set the value to `false`.  
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