8 files declare their use of BillingScheduleInterface in Commerce Recurring Framework 8

BillingScheduleForm.php in src/Form/BillingScheduleForm.php

BillingScheduleTest.php in tests/src/FunctionalJavascript/BillingScheduleTest.php

BillingScheduleTest.php in tests/src/Kernel/Entity/BillingScheduleTest.php

CronTest.php in tests/src/Kernel/CronTest.php

InitialOrderProcessor.php in src/InitialOrderProcessor.php

OrderRefreshTest.php in tests/src/Kernel/OrderRefreshTest.php

RecurringOrderManagerTest.php in tests/src/Kernel/RecurringOrderManagerTest.php

SubscriptionTypeBase.php in src/Plugin/Commerce/SubscriptionType/SubscriptionTypeBase.php