Pre-filling/Passing custom fields to hosted pages (via Plan URL)

Description:

Custom fields can be used to capture additional information link to the customer or a specific subscription.

To know how to create custom fields Click Here.

These custom fields can be configured to be Hidden, Read-only, Mandatory or Editable.

Solution:

You can pre-fill custom field value in two ways, either through Checkout page script or through the API call. Please refer the example shown under Cart customizations in Here. The custom field ID can also be added to the script in a similar manner to pre-fill the value in Checkout Page.