Tenger Plugin: hidden fields
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Contact Form 7 Modules
Contact Form 7 – Add useful modules such as hidden fields and "send all fields" to the Contact Form 7 plugin
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Dynamic Input For WPForms
Easily add dynamic text, dynamic hidden fields, and advanced customization to WPForms.
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Send Ref
Add hidden fields to Contact Form 7 (or other contact forms) with all the parameters in the URL.