Web: teambuyin.com/signup
The signup page says 'Start your free performance pay trial'. It is free for 14 days with no credit card needed. Fill out the form in four steps: company name, your first and last name, your phone number, and your email. Then TeamBuyIn emails you a sign-in link.
Use the same email address you use in Housecall Pro or Jobber. Choose your software on the form. Connecting Housecall Pro needs the MAX plan and an Admin login.
After you submit, use the inbox shortcut to open your email, click the link, and sign in. New accounts start on Setup > Settings > Integrations so you can connect your software first. See Connect with Housecall Pro or Connect or reconnect your Jobber account.
If you start from the Jobber App Store, authorize TeamBuyIn first, then create your account.