From your dashbaord go to Admin or click on https://inside.schoolab.tools/admin/contracts

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/7631309b-68fa-4d52-b98d-84f7df896610/Capture_decran_2020-05-05_a_14.02.42.png

In the new tab , click on contract. Scroll down to Billing configuration +Show more

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/b5f5ebc4-1e89-4d06-a95c-d1ed4198dabb/Capture_decran_2020-05-05_a_15.10.17.png

Click on +New to add billing configuration and on the right side dropdown button to Edit.

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/edf1effb-d780-422e-b07f-98d8f52ebcac/Capture_decran_2020-05-05_a_16.10.43.png

Complete all required informations +Create a billing configuration.

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/b20af5d2-6400-454a-b0c3-77050371f6e4/Capture_decran_2020-05-05_a_16.15.04.png