Invitation code

hi, I’m a new user of gravity form. I’m looking for a way to put an “invitation code” field on a form. This field must check the previous existence of the code, these codes have already been manually generated previously, they are uniquely assigned to my agents, by registering the code I can know which agent sent the potential customer to my form.
I searched for add-ons but found nothing that could help me. I need help. thank you

Hello. There is no built-in functionality in Gravity Forms that can do that. You can do it with your own PHP using the gform_field_validation filter:

Or Gravity Wiz Populate Anything plugin can do this also:

And there is another plugin that used to work for this as well. You would need to check it out to see if it is still available and can meet your needs:

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