The SOS Pay setup process must be completed before customers can make online payments. Once the setup checklist is finished, you can begin emailing invoices with payment links to customers.
SOS Inventory adds a Customer payment link to an invoice transaction record at the time it is saved, as shown in the screenshot below. The link connects to a secure payment page where the customer can pay the invoice online. (The icon next to the Customer payment link allows you to copy the URL to which the link directs, but this is not needed for emailing an invoice.)

When you are ready to email an invoice to the customer:
![For online payments, include the [PaymentLink] code in the Email message for invoices.](https://dzf8vqv24eqhg.cloudfront.net/userfiles/35832/45556/ckfinder/images/qu/2026/2026-04-20_15-12-28_Invoice_email_payment_link_new.png?Policy=eyJTdGF0ZW1lbnQiOlt7IlJlc291cmNlIjoiaHR0cHM6Ly9kemY4dnF2MjRlcWhnLmNsb3VkZnJvbnQubmV0L3VzZXJmaWxlcy8zNTgzMi80NTU1Ni9ja2ZpbmRlci9pbWFnZXMvcXUvMjAyNi8yMDI2LTA0LTIwXzE1LTEyLTI4X0ludm9pY2VfZW1haWxfcGF5bWVudF9saW5rX25ldy5wbmciLCJDb25kaXRpb24iOnsiRGF0ZUxlc3NUaGFuIjp7IkFXUzpFcG9jaFRpbWUiOjE3OTAwMTc0NTF9fX1dfQ__&Signature=APjKrnMTgvjGkR5hQjJmM4gP9iRaa9YLFvo9Va8gyGAtAXSKBUyCN9GFgkqYyHl79BoKVise463tazC3-ogwz6x0J7rqV460mkK8f4dYdvkihgUQJyZu8TCgNNNVTKE1YrS6D3UeUhLNAHXMgxslp1x1c8jLwuRfHgAu54oNNEq1N4~hd8HP4AEkvIhzYrCM6HAi0itA1mwcaZ9Kho-qUh5SPGgXKQfqYTkxtCT~p8KjB8VOztao1lpQsZv0liHiffk3er~2vDmbTeOTfsX8B-24xZNLCt4cmTCvWBK69VtSGhhdaK02JpmXmZ782ao5bCccv48uuaQIWVg6IHPzIg__&Key-Pair-Id=K2TK3EG287XSFC)
When the customer clicks an emailed invoice's payment link, an online version of the invoice will appear:

On this page, you will see two buttons that allow you to select your payment method.
If you need more information on the pop-up windows, see Using SOS Pay payment methods.
The system will notify the customer immediately whether the payment was processed successfully.

After your customer has completed their payment, they can get a PDF copy of their paid invoice by using the Download button. The receipt that the customer gets will use the template that your company has designated in the Invoice template field of the Payment settings (Tools & settings > Configuration > Payments > General).