SUPPORT-35419: making custom field not required

Author: ShipilA

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

@@ -4,6 +4,9 @@
 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;
+
+import java.util.Optional;
 
 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 +1,28 @@
+package com.commercetools;
+
+import com.commercetools.api.models.cart_discount.CartDiscountValue;
+import com.commercetools.api.models.cart_discount.CartDiscountValueAbsoluteDraft;
+import com.commercetools.api.models.common.LocalizedString;
+import com.commercetools.api.models.common.Money;
+import com.commercetools.api.models.customer.CustomerResourceIdentifierBuilder;
+import com.commercetools.api.models.payment.PaymentDraft;
+import com.commercetools.api.models.payment.PaymentMethodInfo;
+import org.assertj.core.api.Assert;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mock;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+public class PaymentMethodInfoMixinTest {
+    @Test
+    public void noCustomFieldTest() {
+        var paymentMethodInfo = PaymentMethodInfo.builder()
+                .paymentInterface("interface")
+                .method("method")
+                .name(LocalizedString.of())
+                .build();
+
+        assertNotNull(paymentMethodInfo.toDraft());
+    }
+}