in What can I?
Contactform7 is a easy form builder plugin of wordpress. We have tried to make easier to send otp to users through ContactForm7 by following easy steps.

Steps to Integrate Otp Verification with ContactForm7

Go to SMS Alert Tab in the form of ContactForm7 and copy the code as shown in below screenshot.

Go to Your Form and paste it

Add this shortcode [smsalert_verify_phone] after shortcode of contactform 7 in page.

Now these fields will be appeared in your form and now submit the form with OTP Verification.