On-chain Bitcoin transactions require a small network fee for each transaction. This means that invoices can sometimes be underpaid by your customers if they fail to correctly estimate an appropriate fee for the transaction.
To ensure a seamless checkout experience, OpenNode gives you the ability to set an underpaid threshold that accepts payments that are slightly underpaid. You can set your threshold from .1% to 5% directly from your dashboard in Settings → Payments.
It is not necessary to set a threshold but it is recommended. There will be customers who use exchanges as their wallet that do not take into account the withdrawal fees.
Note: The underpaid threshold only deals with on-chain payments. It is impossible to underpay a Lightning invoice.
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