In 17hats, you can record a payment manually within an Invoice, or from the Bookkeeping section. 

If a cash, credit card or check deposit comes through your bank feed and you need to apply it towards an invoice: 

Note:  Only apply a transaction to an invoice if the payment has not yet been recorded.  If a payment has already been recorded, then the transaction should be categorized as "transfer between accounts.
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When applying a bookkeeping income transaction to an invoice, two options will appear, "Assign to Invoice", or "Assign to Payment".
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"Assign to Invoice" will show a drop-down of all your open invoices.
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​"Assign to Payment" will show a drop-down of all your open payments
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Your transaction will then be merged with the payment and removed from the transactions overview in the Bookkeeping section.
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