Send dynamic promotions and metadata via addToCart method.

dynamic-promotion.diff

diff --git a/packages/nextjs-starter-autonomy/src/redux/actions/cart/add-to-cart.js b/packages/nextjs-starter-autonomy/src/redux/actions/cart/add-to-cart.js
index e1733c3..eab6c7d 100644
--- a/packages/nextjs-starter-autonomy/src/redux/actions/cart/add-to-cart.js
+++ b/packages/nextjs-starter-autonomy/src/redux/actions/cart/add-to-cart.js
@@ -12,12 +12,18 @@ export const addToCartRequest = sku => {
   }
 }
 
-export const addToCartSuccess = (cart, variant, quantity) => {
+export const addToCartSuccess = (
+  cart,
+  variant,
+  quantity,
+  additional_properties = {}
+) => {
   return {
     type: ADD_TO_CART_SUCCESS,
     data: cart,
     variant,
-    quantity
+    quantity,
+    additional_properties
   }
 }
 
@@ -31,14 +37,14 @@ export const addToCartError = (error, meta = {}) => {
 }
 
 export const addToCart =
-  (sku, quantity) =>
+  (sku, quantity, additional_properties = {}) =>
   async (dispatch, getState, { api }) => {
     try {
       dispatch(addToCartRequest(sku))
 
       const { data: cart } = await getOrLoadCart(dispatch, getState)
 
-      await api.addToCart(cart, sku, quantity)
+      await api.addToCart(cart, sku, quantity, additional_properties)
 
       const updatedCart = await api.fetchCart(cart.number)
 
@@ -46,9 +52,11 @@ export const addToCart =
         li => li.variant.sku === sku
       )
       const variant = addLineItem.variant
-      dispatch(addToCartSuccess(updatedCart, variant, quantity))
+      dispatch(
+        addToCartSuccess(updatedCart, variant, quantity, additional_properties)
+      )
     } catch (error) {
-      dispatch(addToCartError(error, { sku, quantity }))
+      dispatch(addToCartError(error, { sku, quantity, additional_properties }))
       throw error
     }
   }
diff --git a/packages/nextjs-starter-autonomy/src/services/api/index.js b/packages/nextjs-starter-autonomy/src/services/api/index.js
index 1c6d4c0..66ae5fe 100644
--- a/packages/nextjs-starter-autonomy/src/services/api/index.js
+++ b/packages/nextjs-starter-autonomy/src/services/api/index.js
@@ -64,13 +64,14 @@ class Api {
     return response.data
   }
 
-  async addToCart(cart, sku, quantity) {
+  async addToCart(cart, sku, quantity, additional_properties = {}) {
     const url = `/api/orders/${cart.number}/line_items`
 
     const payload = {
       line_item: {
         sku: sku,
-        quantity: quantity
+        quantity: quantity,
+        ...additional_properties
       }
     }
 
diff --git a/packages/nextjs-starter-autonomy/src/services/api/index.test.js b/packages/nextjs-starter-autonomy/src/services/api/index.test.js
index 5a029db..6b69c3b 100644
--- a/packages/nextjs-starter-autonomy/src/services/api/index.test.js
+++ b/packages/nextjs-starter-autonomy/src/services/api/index.test.js
@@ -64,10 +64,23 @@ describe('api', () => {
     const cart = { number: 'CART-ID' }
     const sku = 'SOME-SKU'
     const quantity = 3
+    const additional_properties = {
+      some_property: 'property',
+      array_of_objects: [
+        { some_property: 'property' },
+        { some_property: 'property' }
+      ]
+    }
+
     const payload = {
       line_item: {
         sku: sku,
-        quantity: quantity
+        quantity: quantity,
+        some_property: 'property',
+        array_of_objects: [
+          { some_property: 'property' },
+          { some_property: 'property' }
+        ]
       }
     }
 
@@ -76,7 +89,7 @@ describe('api', () => {
         return {}
       })
 
-      api.addToCart(cart, sku, quantity)
+      api.addToCart(cart, sku, quantity, additional_properties)
 
       expect(axios.post).toHaveBeenCalledWith(
         `/api/orders/${cart.number}/line_items`,