diff --git a/packages/GA4Client/src/commerce-handler.js b/packages/GA4Client/src/commerce-handler.js
index 2356e99..15c407a 100644
--- a/packages/GA4Client/src/commerce-handler.js
+++ b/packages/GA4Client/src/commerce-handler.js
@@ -54,18 +54,18 @@ CommerceHandler.prototype.logCommerceEvent = function (event) {
             event.CustomFlags[GA4_COMMERCE_EVENT_TYPE] === VIEW_CART
         ) {
             isViewCartEvent = true;
-            return logViewCart(event, affiliation);
+            return this.logViewCart(event, affiliation);
         }
     }
     // Handle Impressions
     if (event.EventCategory === ProductActionTypes.Impression) {
-        return logImpressionEvent(event, affiliation);
+        return this.logImpressionEvent(event, affiliation);
         // Handle Promotions
     } else if (
         event.EventCategory === PromotionActionTypes.PromotionClick ||
         event.EventCategory === PromotionActionTypes.PromotionView
     ) {
-        return logPromotionEvent(event);
+        return this.logPromotionEvent(event);
     }
 
     switch (event.EventCategory) {
@@ -99,7 +99,7 @@ CommerceHandler.prototype.logCommerceEvent = function (event) {
             break;
 
         case ProductActionTypes.CheckoutOption:
-            return logCheckoutOptionEvent(event, affiliation);
+            return this.logCheckoutOptionEvent(event, affiliation);
 
         default:
             // a view cart event is handled at the beginning of this function
@@ -136,10 +136,144 @@ CommerceHandler.prototype.logCommerceEvent = function (event) {
             null;
     }
 
-    gtag('event', mapGA4EcommerceEventName(event), ga4CommerceEventParameters);
+    this.sendCommerceEventToGA4(
+        mapGA4EcommerceEventName(event),
+        ga4CommerceEventParameters
+    );
     return true;
 };
 
+CommerceHandler.prototype.sendCommerceEventToGA4 = function (
+    eventName,
+    eventAttributes
+) {
+    if (this.common.forwarderSettings.measurementId) {
+        eventAttributes.send_to = this.common.forwarderSettings.measurementId;
+    }
+
+    gtag('event', eventName, eventAttributes);
+};
+
+// Google previously had a CheckoutOption event, and now this has been split into 2 GA4 events - add_shipping_info and add_payment_info
+// Since MP still uses CheckoutOption, we must map this to the 2 events using custom flags.  To prevent any data loss from customers
+// migrating from UA to GA4, we will set a default `set_checkout_option` which matches Firebase's data model.
+CommerceHandler.prototype.logCheckoutOptionEvent = function (
+    event,
+    affiliation
+) {
+    try {
+        var customFlags = event.CustomFlags,
+            GA4CommerceEventType = customFlags[GA4_COMMERCE_EVENT_TYPE],
+            ga4CommerceEventParameters;
+
+        // if no custom flags exist or there is no GA4CommerceEventType, the user has not updated their code from using legacy GA which still supports checkout_option
+        if (!customFlags || !GA4CommerceEventType) {
+            console.error(
+                'Your checkout option event for the Google Analytics 4 integration is missing a custom flag for "GA4.CommerceEventType". The event was sent using the deprecated set_checkout_option event.  Review mParticle docs for GA4 for the custom flags to add.'
+            );
+        }
+
+        switch (GA4CommerceEventType) {
+            case ADD_SHIPPING_INFO:
+                ga4CommerceEventParameters = buildAddShippingInfo(
+                    event,
+                    affiliation
+                );
+                break;
+            case ADD_PAYMENT_INFO:
+                ga4CommerceEventParameters = buildAddPaymentInfo(
+                    event,
+                    affiliation
+                );
+                break;
+            default:
+                ga4CommerceEventParameters = buildCheckoutOptions(
+                    event,
+                    affiliation
+                );
+                break;
+        }
+    } catch (error) {
+        console.error(
+            'There is an issue with the custom flags in your CheckoutOption event. The event was not sent.  Plrease review the docs and fix.',
+            error
+        );
+        return false;
+    }
+
+    this.sendCommerceEventToGA4(
+        mapGA4EcommerceEventName(event),
+        ga4CommerceEventParameters
+    );
+
+    return true;
+};
+
+CommerceHandler.prototype.logPromotionEvent = function (event) {
+    var ga4CommerceEventParameters;
+    try {
+        event.PromotionAction.PromotionList.forEach(function (promotion) {
+            ga4CommerceEventParameters = buildPromotion(promotion);
+        });
+    } catch (error) {
+        console.error(
+            'Error logging Promotions to GA4. Promotions not logged.',
+            error
+        );
+        return false;
+    }
+
+    this.sendCommerceEventToGA4(
+        mapGA4EcommerceEventName(event),
+        ga4CommerceEventParameters
+    );
+    return true;
+};
+
+CommerceHandler.prototype.logImpressionEvent = function (event, affiliation) {
+    var ga4CommerceEventParameters;
+    try {
+        event.ProductImpressions.forEach(function (impression) {
+            ga4CommerceEventParameters = parseImpression(
+                impression,
+                affiliation
+            );
+        });
+    } catch (error) {
+        console.log(
+            'Error logging Impressions to GA4. Impressions not logged',
+            error
+        );
+        return false;
+    }
+
+    this.sendCommerceEventToGA4(
+        mapGA4EcommerceEventName(event),
+        ga4CommerceEventParameters
+    );
+
+    return true;
+};
+
+CommerceHandler.prototype.logViewCart = function (event, affiliation) {
+    var ga4CommerceEventParameters = buildViewCart(event, affiliation);
+    ga4CommerceEventParameters = this.common.mergeObjects(
+        ga4CommerceEventParameters,
+        this.common.limitEventAttributes(event.EventAttributes)
+    );
+    ga4CommerceEventParameters.currency = event.CurrencyCode;
+
+    ga4CommerceEventParameters.value =
+        (event.CustomFlags && event.CustomFlags['GA4.Value']) ||
+        event.ProductAction.TotalAmount ||
+        null;
+
+    this.sendCommerceEventToGA4(
+        mapGA4EcommerceEventName(event),
+        ga4CommerceEventParameters
+    );
+};
+
 function buildAddOrRemoveCartItem(event, affiliation) {
     return {
         items: buildProductsList(event.ProductAction.ProductList, affiliation),
@@ -394,117 +528,6 @@ function getCheckoutOptionEventName(customFlags) {
     }
 }
 
-// Google previously had a CheckoutOption event, and now this has been split into 2 GA4 events - add_shipping_info and add_payment_info
-// Since MP still uses CheckoutOption, we must map this to the 2 events using custom flags.  To prevent any data loss from customers
-// migrating from UA to GA4, we will set a default `set_checkout_option` which matches Firebase's data model.
-function logCheckoutOptionEvent(event, affiliation) {
-    try {
-        var customFlags = event.CustomFlags,
-            GA4CommerceEventType = customFlags[GA4_COMMERCE_EVENT_TYPE],
-            ga4CommerceEventParameters;
-
-        // if no custom flags exist or there is no GA4CommerceEventType, the user has not updated their code from using legacy GA which still supports checkout_option
-        if (!customFlags || !GA4CommerceEventType) {
-            console.error(
-                'Your checkout option event for the Google Analytics 4 integration is missing a custom flag for "GA4.CommerceEventType". The event was sent using the deprecated set_checkout_option event.  Review mParticle docs for GA4 for the custom flags to add.'
-            );
-        }
-
-        switch (GA4CommerceEventType) {
-            case ADD_SHIPPING_INFO:
-                ga4CommerceEventParameters = buildAddShippingInfo(
-                    event,
-                    affiliation
-                );
-                break;
-            case ADD_PAYMENT_INFO:
-                ga4CommerceEventParameters = buildAddPaymentInfo(
-                    event,
-                    affiliation
-                );
-                break;
-            default:
-                ga4CommerceEventParameters = buildCheckoutOptions(
-                    event,
-                    affiliation
-                );
-                break;
-        }
-    } catch (error) {
-        console.error(
-            'There is an issue with the custom flags in your CheckoutOption event. The event was not sent.  Plrease review the docs and fix.',
-            error
-        );
-        return false;
-    }
-
-    gtag('event', mapGA4EcommerceEventName(event), ga4CommerceEventParameters);
-
-    return true;
-}
-
-function logPromotionEvent(event) {
-    try {
-        var ga4CommerceEventParameters;
-        event.PromotionAction.PromotionList.forEach(function (promotion) {
-            ga4CommerceEventParameters = buildPromotion(promotion);
-            gtag(
-                'event',
-                mapGA4EcommerceEventName(event),
-                ga4CommerceEventParameters
-            );
-        });
-        return true;
-    } catch (error) {
-        console.error(
-            'Error logging Promotions to GA4. Promotions not logged.',
-            error
-        );
-    }
-    return false;
-}
-
-function logImpressionEvent(event, affiliation) {
-    try {
-        var ga4CommerceEventParameters;
-        event.ProductImpressions.forEach(function (impression) {
-            ga4CommerceEventParameters = parseImpression(
-                impression,
-                affiliation
-            );
-
-            gtag(
-                'event',
-                mapGA4EcommerceEventName(event),
-                ga4CommerceEventParameters
-            );
-        });
-    } catch (error) {
-        console.log(
-            'Error logging Impressions to GA4. Impressions not logged',
-            error
-        );
-        return false;
-    }
-    return true;
-}
-
-function logViewCart(event, affiliation) {
-    var ga4CommerceEventParameters = buildViewCart(event, affiliation);
-    ga4CommerceEventParameters = self.common.mergeObjects(
-        ga4CommerceEventParameters,
-        self.common.limitEventAttributes(event.EventAttributes)
-    );
-    ga4CommerceEventParameters.currency = event.CurrencyCode;
-
-    ga4CommerceEventParameters.value =
-        (event.CustomFlags && event.CustomFlags['GA4.Value']) ||
-        event.ProductAction.TotalAmount ||
-        null;
-    gtag('event', mapGA4EcommerceEventName(event), ga4CommerceEventParameters);
-    return true;
-}
-
 function buildViewCart(event, affiliation) {
     return {
         items: buildProductsList(event.ProductAction.ProductList, affiliation),
diff --git a/packages/GA4Client/src/event-handler.js b/packages/GA4Client/src/event-handler.js
index 9c875b5..2a47939 100644
--- a/packages/GA4Client/src/event-handler.js
+++ b/packages/GA4Client/src/event-handler.js
@@ -45,6 +45,11 @@ EventHandler.prototype.sendEventToGA4 = function (eventName, eventAttributes) {
         standardizedAttributes
     );
 
+    if (this.common.forwarderSettings.measurementId) {
+        standardizedAttributes.send_to =
+            this.common.forwarderSettings.measurementId;
+    }
+
     gtag(
         'event',
         this.common.truncateEventName(standardizedEventName),