Payers can manage their recurring plans within the Payer Portal. To allow them (within the Payer Portal) to update the custom field responses they provided at checkout:

1) Click on the Payer Portal option in your Account drop down menu.

2) Scroll to the “Allow payer to” section and click to enable the “Update custom field responses?” option.
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3) Click Save.

4) Now, when your payers go to their Payer Portal, they will be able to update their custom field responses.