From the Invoiced dashboard go to Settings → Payments.

Click Setup below the Credit Card option and then click Yes when asked if you already have a payment processor.

Select LawPay from the Gateway drop-down menu.

Click Connect to LawPay. You will be taken to a screen to sign into your LawPay account, if you are not already signed in. Enter in your LawPay username and password and click Sign In.

Next, authorize the Invoiced application by clicking Authorize. Your LawPay account is now connected and the payment method is enabled.

You may need to change the default LawPay account that will be used to receive payments. Invoiced selects the operating account by default, however, you may wish to receive payments in a different account.