Purpose:

Edit the online payment status and configuration for getting invoices paid online.

Explanation: 

An invoice (sales invoice) is a document requesting payment for products and services. In this case, a sales invoice is applied to Customers of the Cheqbook user. The invoice usually includes the products/services, quantities, prices, and payment terms. 

Actions:

Accept Online Payment: Use the slider bar to select "Yes" or "No".

Paypal Email: Enter Paypal Email.

Save: Click "Save" to save your changes.

Cancel: Click "Cancel" to cancel your changes.

Additional Resources:

Wikipedia Invoice