Your invoice can include a remittance payment details section. This is a section at the bottom of invoices that is designed for your customer to manually cut off, complete and send back with payment.
In the Web Portal, go to the Settings cog > Accounts > Invoices > scroll down to PDF Options section > select Yes or No under 'Include a Remittance Payment advice section to invoices'
In the App, Login > Settings cog in bottom right corner > Invoices > toggle Remittance Payment Details on/off > Save.
