The Teamleader API is designed for developers, engineers, or anyone else who’s comfortable creating custom-coded solutions or integrating with APIs. If you think you may need some help integrating with the Teamleader API, visit the API documents or reach out to our support team.

We do want to emphasize though that we will not develop a custom solution for you. In case you need more extensive support, then we recommend some of our partners, who are happy to help. Just write an email to

Important remarks:

  • Teamleader uses multipart/form-data. Make sure that you are not using another type of data, like x-www-form-urlencoded.
  • Pay attention that you always use the type 'post'.
  • Our API examples are in php. However, our API is not specific to php, .net and .php are similar and will follow the same principles.