diff --git a/mParticle-UrbanAirship/MPKitUrbanAirship.m b/mParticle-UrbanAirship/MPKitUrbanAirship.m
index 2b2b8cf..8fbd87c 100755
--- a/mParticle-UrbanAirship/MPKitUrbanAirship.m
+++ b/mParticle-UrbanAirship/MPKitUrbanAirship.m
@@ -25,6 +25,7 @@
 
 NSString * const UAConfigAppKey = @"applicationKey";
 NSString * const UAConfigAppSecret = @"applicationSecret";
+NSString * const UAConfigCustomDomainProxyUrl = @"customDomainProxyUrl";
 NSString * const UAConfigEnableTags = @"enableTags";
 NSString * const UAConfigIncludeUserAttributes = @"includeUserAttributes";
 NSString * const UAConfigNamedUserId = @"namedUserIdField";
@@ -140,6 +141,12 @@ - (void)start {
         
         // Enable passive APNS registration
         config.requestAuthorizationToUseNotifications = NO;
+
+        // Enable custom domain proxy if provided
+        if (self.configuration[UAConfigCustomDomainProxyUrl]) {
+            config.initialConfigURL = self.configuration[UAConfigCustomDomainProxyUrl];
+            config.URLAllowList = [config.URLAllowList arrayByAddingObject:self.configuration[UAConfigCustomDomainProxyUrl]];
+        }
         
         if ([MParticle sharedInstance].environment == MPEnvironmentDevelopment) {
             config.developmentAppKey = self.configuration[UAConfigAppKey];