If you would like to offer your registrants the option to pay their registration fees with instalments, then you will be interested in Payment Plans. This allows you to set up a number of Payment Plans that your registrants can pick from during registration, allowing for your forms to be flexible and inclusive.
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First you will want to navigate to Power-Ups and check out the Payment Plans power-up. You will then want to enable that and navigate back to your Registration Forms.

Then you can start the process of Configuring My Payment Plans.