How can you synchronize your contacts from Teamleader?

Go to 'Developers' in the menu and click on 'Integrations'.

You now see Teamleader among the available integrations.

You can now click on 'Proceed'. And you'll see the window underneath.

You'll have to fill in your 'Client ID' and your 'Client Secret'. You can find it by going back to Smstools en go to 'API & Webhooks'.

You can now log in to your Teamleader account.

Once you’ve logged in, you’ll see the window shown below. You can now go back to Smstools and your Teamleader account will be connected.

Updated on: 21/01/2026