SUPPORT-35419: making custom field not required

.git-blame-ignore-revs

@@ -9,3 +9,5 @@ de95c481329aa8b821e6e71ac35c1b8bc67e3e86
 78c44064f4ec15091bde7a2dc590aa2b3a99341d
 03665b75a1e1c3a3cf28df1dec52e91b308e4368
 7e25c796da25ae080a952936de535a1228fed448
+7ceb871552e5d9cb0379fbba014690aa067061eb
+af9205fa592e4ae32ceca951c560a48b512b7744

commercetools/commercetools-sdk-java-api/src/main/java/com/commercetools/api/models/payment/PaymentMethodInfoMixin.java

@@ -1,9 +1,12 @@
 
 package com.commercetools.api.models.payment;
 
+import java.util.Optional;
+
 import com.commercetools.api.models.common.LocalizedString;
 import com.commercetools.api.models.payment_method.PaymentMethodToken;
 import com.commercetools.api.models.type.CustomFields;
+import com.commercetools.api.models.type.CustomFieldsMixin;
 
 public interface PaymentMethodInfoMixin {
 
@@ -26,7 +29,7 @@ public default PaymentMethodInfoDraft toDraft() {
                 .paymentInterface(getPaymentInterface())
                 .token(getToken())
                 .interfaceAccount(getInterfaceAccount())
-                .custom(getCustom().toDraft())
+                .custom(Optional.ofNullable(getCustom()).map(CustomFieldsMixin::toDraft).orElse(null))
                 .build();
     }
 }

commercetools/commercetools-sdk-java-api/src/test/java/com/commercetools/PaymentMethodInfoMixinTest.java

@@ -0,0 +1,23 @@
+
+package com.commercetools;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import com.commercetools.api.models.common.LocalizedString;
+import com.commercetools.api.models.payment.PaymentMethodInfo;
+import com.commercetools.api.models.payment.PaymentMethodInfoDraft;
+
+import org.junit.jupiter.api.Test;
+
+public class PaymentMethodInfoMixinTest {
+    @Test
+    public void noCustomFieldTest() {
+        var paymentMethodInfo = PaymentMethodInfo.builder()
+                .paymentInterface("interface")
+                .method("method")
+                .name(LocalizedString.of())
+                .build();
+
+        assertInstanceOf(PaymentMethodInfoDraft.class, paymentMethodInfo.toDraft());
+    }
+}