The name of the payment service provider processing the transaction.
enum ExternalProcessor {
ACI_WORLDWIDE
ADYEN
AIB_MERCHANT_SERVICES
AMAZON_PAY
AUTHORIZE_NET
AUTOPAY
BAMBORA
BANK_OF_AMERICA_MERCHANT_SERVICES
BARCLAYCARD_PAYMENTS
BUCKAROO
CHASE
CHECKOUT_COM
CM_COM
COMPUTOP
ECOMMPAY
ELAVON
EMERCHANTPAY
FIS
FISERV
GETNET
GLOBAL_PAYMENTS
GOCARDLESS
HEARTLAND_PAYMENT_SYSTEMS
HELCIM
MOLLIE
MONERIS
MULTISAFEPAY
NEXI_GROUP
NUVEI
OPAYO
PAYONE
PAYSAFE
PAYU
PPRO
PRIORITY_TECHNOLOGY
PRZELEWY24
RAPYD
REDSYS
SHIFT4_PAYMENTS
SQUARE
STRIPE
TRUSTLY
TRUST_PAYMENTS
TSYS
UNZER
VERIFONE_2CHECKOUT
WELLS_FARGO_MERCHANT_SERVICES
WORLDLINE
WORLDPAY
}