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What does ERR_NGROK_BILLING_CARD_MANDATE_REFUSED mean?

ngrok returns ERR_NGROK_BILLING_CARD_MANDATE_REFUSED with this message:
Troubleshoot ERR_NGROK_BILLING_CARD_MANDATE_REFUSED with your AI agent. Connect it to the ngrok MCP server, then ask what caused the error and how to fix it.

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Where can I get more help with ERR_NGROK_BILLING_CARD_MANDATE_REFUSED?

Email support@ngrok.com and include the error code.