Accept Cash, Checks, and Other Tender with Square Invoices
With Square Invoices you are able to accept several types of tender for payment, including non-card payments. To accept a payment for an invoice:
Log in to your online Square Dashboard > Invoices.
Select the invoice in question from your Invoices tab.
Click Add Payment.
Select Record Payment and then pick the payment method. You can choose from cash, check, Square Point of Sale, or other.
Note: If you select Square Point of Sale as a payment method, the invoice will be marked as Paid but will not be recorded in your Transactions on the Invoice Overview page to avoid double entry. Refer to the Point of Sale transaction for details and refunding.