A merchant may send you an invoice instead of a payment link.
Pay an invoice
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Open the invoice link. You see who it is from, who it is billed to, the line items and the total.
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Choose Pay this invoice or Pay renewal.
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Pick the asset and network you hold, then Pay the amount. The next step works the same as a normal payment: the exact amount is locked, and you send it to the address shown.

Invoice statuses
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Draft — not issued yet.
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Unpaid — waiting for you.
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Partially paid — some has been paid. Amount due shows what is left.
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Paid — done.
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Overdue — past the due date.
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Void — cancelled. Do not pay it.
Receipts
After a payment succeeds, use Download receipt on the payment page. On an invoice, use Download invoice.

Subscriptions
An invoice or checkout for a subscription shows the interval, for example / mo. It is billed each period on the billing date.
Something looks wrong on the invoice
Contact the merchant. Mayarin pays the merchant on their behalf and cannot change the invoice.