Do you want to enable Formidable forms unique field?
You can check whether input filed data is already submitted or not by the unique input option.
It will help you to prevent duplicate submissions from formidable forms (eg: Email already exists).
Demo: https://demo-form.wpdebuglog.com/formidable-form-example/
How to Enable Formidable Forms Unique Input Field?
Step 1: Purchase and download the Formidable Forms unique plugin. Then go to wp-admin > plugins > add new > upload the zip file.
Step 2: Go to wp-admin > formidable forms > select form > Advanced > Click on the unique input check box.
Now, you can edit the error message “Already submitted”.
Step 3: Finished, You can check it on the frontend form.
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Unlimited installation license $29
No restrictions. No yearly or monthly fee. You will receive the complete source code.