When you have payment integration in your form and want to push data to Salesforce only when the payment is executed - you can easily do so by turning on the checkbox in the last category of the Push settings window.
Watch How you can push repeated section data to Salesforce upon payment
However, if you were trying to push data from a repeatable section it would not work as planned and only one line would be pushed. In this version, we’ve decided to support the repeated section when data is pushed upon payment.
Enjoy!