10 classes are annotated with UbercartPaymentMethod in Ubercart 8.4

AuthorizeNet in payment/uc_authorizenet/src/Plugin/Ubercart/PaymentMethod/AuthorizeNet.php

Defines the Authorize.net payment method.

CashOnDelivery in payment/uc_payment_pack/src/Plugin/Ubercart/PaymentMethod/CashOnDelivery.php

Defines the cash on delivery payment method.

Check in payment/uc_payment_pack/src/Plugin/Ubercart/PaymentMethod/Check.php

Defines the check payment method.

FreeOrder in payment/uc_payment/src/Plugin/Ubercart/PaymentMethod/FreeOrder.php

Defines a free order payment method.

Other in payment/uc_payment_pack/src/Plugin/Ubercart/PaymentMethod/Other.php

Defines a generic payment method.

PayPalExpressCheckout in payment/uc_paypal/src/Plugin/Ubercart/PaymentMethod/PayPalExpressCheckout.php

Defines the PayPal Express Checkout payment method.

PayPalPaymentsStandard in payment/uc_paypal/src/Plugin/Ubercart/PaymentMethod/PayPalPaymentsStandard.php

Defines the PayPal Payments Standard payment method.

PayPalWebsitePaymentsPro in payment/uc_paypal/src/Plugin/Ubercart/PaymentMethod/PayPalWebsitePaymentsPro.php

Defines the PayPal Website Payments Pro payment method.

TestGateway in payment/uc_credit/src/Plugin/Ubercart/PaymentMethod/TestGateway.php

Defines the test gateway payment method.

TwoCheckout in payment/uc_2checkout/src/Plugin/Ubercart/PaymentMethod/TwoCheckout.php

Defines the 2Checkout payment method.