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How about a credit card anonymization service, such that the bank allows you to generate a virtual 'card number' useful for payments to only one merchant?

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Several (many?) banks do this. I've used citibank's 'virtual account numbers' in the past when dealing with merchants I did not trust.

Seconding citi virtual cards. You can also limit the maximum amount a virtual card can be charged.

This used to be a feature that several cards advertised, but seems it has been completely dropped by them all in the last 5 years.

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