Step 1: Go to the TMS URL: 

Step 2: Choose the correct account

Step 3: Click on the Extension Manager menu item.

Step 4: Click on the Extensionsub-menu item.

Step 5: Select the correct extension.

Step 6: Click on the Details tab at the top. Scroll down to the “Integration” section.

Step 7: Enable the API Integration.

Step 8: Click Apply to save the changes.