"Blockchain transaction processing" is the term for the procedure used to receive and process money made using currencies such as Bitcoin, Ethereum, or Litecoin.

To "process bitcoin payments," a merchant typically needs to use a digital currency-compatible payment system. The "cryptocurrency payment" may be converted by the payment gateway using its present conversion rate into the digital currency's preferred money, such as USD or EUR.
https://www.paymentsclarity.com/our-services/crypto-payment-processing