You can add a new customer contact in Moon Invoice easily by following the steps below.

1. Open the Moon Invoice application on your device or tap on this link.
2. From the main menu on your left, go to Sales ➜ Customer.
3. Click the ‘+’ icon to create a customer or select an existing one that you want.
4. Now click on the Edit icon and then you can add contact details, including the Company Name, Reg Number, Tax ID, and others. 
5. Lastly, click on Save to apply the changes.