Payment Field creates a payment button within a result row. The button is not visible in the microapp submit form itself. Payment settings are defined at result level (once created).
More information on using payments can be found in payments.
Note: button configuration is done only on a result/row level. This means it’s not suited to a form/data gathering use-case (ie where you create a form for users to submit data). It would be used in a scenario where you create a form via a microapp in a Buzz, then use that microapp form to create one or more result rows, each of which includes a payment button. You would then edit the payment button settings in each result row, and your end-users/audience would then view these rows and click the payment button in this result view to make a payment. They would not submit new results via the microapp form themselves.