Join It offers several ways to integrate your existing website with your Join It membership database.

One of the most popular approaches is linking directly to the checkout page for a specific membership type. This allows visitors to stay on your organization’s website to learn more, then seamlessly transition to the Join It checkout page when they’re ready to join. The checkout experience itself is a clean, modern, one-page flow designed to reduce friction.

To enhance this experience even further, Join It allows your website to append query parameters to the checkout URL. These parameters can be used to pre-fill the member’s First Name, Last Name, and Email address on the membership form.

Let’s say you have a demo organization with the following URL:

https://app.joinit.com/o/try-it-out

(In this example, try-it-out is the organization’s customizable slug.)

Each membership type has its own checkout URL. For example:

https://app.joinit.com/o/try-it-out/p5nWADCXoSWTdNKwe

You can find this direct checkout link in the details of each Membership Type within your admin dashboard.

If your website already knows a visitor’s information, you can pass the following values as query parameters:

For example, to pre-fill the form for Alexander Hamilton (hamilton@treasury.gov), the final URL would look like this:

https://app.joinit.com/o/try-it-out/p5nWADCXoSWTdNKwe?first_name=alexander&last_name=hamilton&email=hamilton@treasury.gov

When the member arrives at checkout, these fields will already be populated, saving them time and reducing the chance of errors.

Screenshot Description: Showing the page pre-filled with Alexander's information

Query parameters only apply to users who are not logged in to a Join It account.
If an existing user is logged in, their account information will intentionally override any values passed through the URL.

If you’re testing this feature, be sure to log out of Join It or use an incognito/private browser window.