class A implements CheckinVisitPlugin {
    // Whether each node executes depends on configuration in the type settings to trigger methods in this class

    @Override
    CheckinValidate.Result beforeCheckin(CheckinValidate.Arg beforeCheckArg) {
       // Parameters included
        String checkId = beforeCheckFinishArg.checkId as String  // ID of advanced field object (may be null for temporary field operations)
        String mainObjApiName = beforeCheckFinishArg.mainObjApiName as String  // API name of main object for advanced field visit (may be empty)
        String mainObjDataId = beforeCheckFinishArg.mainObjDataId as String  // Data ID of main object for advanced field visit (may be empty)
        String checkTypeId = beforeCheckFinishArg.checkTypeId as String // Field operation type ID, used to distinguish cases where different types share the same APL class (not needed if different types are configured with different APL classes)
        switch(checkTypeId) {
          case "641c093ca70a6f56080ab9a7":
            return CheckinValidate.Result.builder().success(false).block(false).title("Popup Title").message("Popup Content").build();
            break;
          default:
            return CheckinValidate.Result.builder().success(true).build()
        }
    }

    @Override
    CheckinValidate.Result beforeCheckout(CheckinValidate.Arg beforeCheckoutArg) {
        // Construct return result
        return CheckinValidate.Result.builder().success(false).block(false).title("Popup Title").message("Popup Content").build();
    }

    @Override
    CheckinValidate.Result beforeCheckFinish(CheckinValidate.Arg beforeCheckFinishArg) {
        // Construct return result
        return CheckinValidate.Result.builder().success(false).block(true).title("Popup Title").message("Popup Content").build();
    }
}