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SignalWire uses a billing provider that has its own set of rules and systems for validating card transactions. Here are some commonly encountered reasons for rejection errors and the correct way to resolve them:
You may be using a data anonymizing service like The Onion Router, VPN, or routing internet traffic through a proxy server. Please disable your service or attempt to make the purchase from a computer or device that is not being anonymized.
Credit card information is not entered correctly (zip code may not match, billing address may not match, etc), Please add the credit/debit card again, with the correct details, set auto top up to the recently added card, and remove the old credit card from Space.
If none of these resolve the card rejection error, please contact the SignalWire Support team by creating a ticket.
Learn more here.