We have service where all user interaction is done via texting (iMessage) using Sendblue. We want users to be able to refer their friends to get free credits. The easiest way we can think of would be giving that user a link to send to their friends, which, when opened, would auto-populate a message to our number, the content of that message being the referring user's number. Example:

I (phone number +1234) want to refer my friends. I send them a link, which when they click, opens a text message to +4321 (the service) with the text prepopulated with my phone number, "+1234".

Right now the entire service is run through Zapier, so ideally would be able to work through that. You can also enter Javascript blocks into Zapier to manipulate data if that would help.

The only solution I have been able to come up with so far is create a different webpage for every person's phone number, which would just be a https://stackoverflow.com/questions/6480462/how-to-pre-populate-the-sms-body-text-via-an-html-linkAutomation Service with the above that would be clicked automatically on page open.

Is there an existing service that does this (and ideally works with Zapier)? Or would I have to do what is described above? If so, what is the easiest way to integrate that data? Is there a way to automate webpage creation?