Required Fields for a Sale with On-Reader Tipping {#ttp-sis-pymnt-svcs-sale-on-reader-tip-api-reqfields}
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type
:
Set the value to `PaymentRequest`.

merchantReferenceCode
:
Set the value to a unique, user-defined reference code. The code can consist of up to 50 alphanumeric characters, underscores (_), and dashes (-). Avoid using formatting that resembles a telephone number (XXX-XXX-XXXX) or a Social Security number (XXX-XX-XXXX).

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

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

askForTip
:
Set the value to `ON_DEVICE`.