TL;DRA deposit that covers less than the invoice — or one invoice paid across several deposits.
A partial payment is matched to the invoice for its amount; the invoice stays open for the balance and dunning pauses rather than restarting. Several deposits can settle one invoice and one deposit can be split across several.
Where it happens in Sonic
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See it on your contracts
A walkthrough on the agreements and files you actually bill from — not a slide deck.