Alongside powerful online surveys and forms, AidaForm also allows you to create landing pages and Instagram bio pages that may contain links to other social media websites and messengers.
To add a ’Click to Chat in WhatsApp’ button to your form or landing page: Where PHONE is a digit-only full phone number in the international format, e.g. 15551234567, but not +001-(555)1234567, the ‘text’ query parameter includes your pre-filled message. The words in the message are separated with the set of symbols %20. More detailed instructions on how to use WhatsApp’s Click to Chat feature. See how WhatsApp’s Click to Chat feature works in the Bio Contact Page With Links to Social Media Template.How to Add a ’Click to Chat on WhatsApp’ Button
https://wa.me/PHONE?text=I'm%20interested%20in%20your%20car%20for%20sale