Create form validation where inputfield checks if value is in a certain list
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For a client, I have to create a form with name, email and registration code. The registration codes should be in a list. This list should contain 500 generated codes with a length of 8 numbers/letters as for example: “A1B2C3D4”.
If someone fills in the form, the value of the registration code inputfield should be checked if it exists in this list. If so, the code should become “used” and cannot be used again after registration.
Sideinfo, I am a wordpress beginner and I am using WPForms Pro.
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