If you have already completed the steps Adding Your AppID, API Key and Webhook, you may proceed in adding your eFax number to your account.
Navigate to Settings > Fax Numbers and click the '+' button to open the Create Fax modal.
Example of '+' button.
In the Create Fax modal, enter your Fax Number in the Fax Number field and your eFax User ID in the eFax User Id field, grant users Send Permissions if desired, then select Save Changes:
Example of Create Fax modal.
Your number is now ready to be used in the system!