18 files declare their use of PaymentMethodInterface in Payment 8.2

CompletePaymentTest.php in tests/src/Unit/Controller/CompletePaymentTest.php

EventDispatcherCollection.php in src/EventDispatcherCollection.php

EventDispatcherCollectionTest.php in tests/src/Unit/EventDispatcherCollectionTest.php

EventDispatcherInterface.php in src/EventDispatcherInterface.php

Generate.php in src/Tests/Generate.php

ListPaymentMethodsTest.php in tests/src/Unit/Controller/ListPaymentMethodsTest.php

Payment.php in src/Entity/Payment.php

PaymentAccessControlHandlerTest.php in tests/src/Unit/Entity/Payment/PaymentAccessControlHandlerTest.php

PaymentExecuteAccess.php in src/Event/PaymentExecuteAccess.php

PaymentExecuteAccessTest.php in tests/src/Unit/Event/PaymentExecuteAccessTest.php

PaymentExecutionPaymentMethodManagerTest.php in tests/src/Unit/Plugin/Payment/Method/PaymentExecutionPaymentMethodManagerTest.php

PaymentFormTest.php in modules/payment_form/tests/src/Unit/Entity/Payment/PaymentFormTest.php

PaymentInterface.php in src/Entity/PaymentInterface.php

PaymentListBuilderTest.php in tests/src/Unit/Entity/Payment/PaymentListBuilderTest.php

PaymentReferenceBaseTest.php in tests/src/Unit/Element/PaymentReferenceBaseTest.php

PaymentStatusFormTest.php in tests/src/Unit/Entity/Payment/PaymentStatusFormTest.php

SymfonyEventDispatcher.php in src/SymfonyEventDispatcher.php

SymfonyEventDispatcherTest.php in tests/src/Unit/SymfonyEventDispatcherTest.php