Merge pull request #32 from aligent/issue-31_update_create_product_variant

Add methods and examples to create/update product variant

Author: jswift

README.md

@@ -43,6 +43,38 @@ echo "Found {$productsResponse->getPagination()->total} products";
 $products = $productsResponse->getProducts();
 ```
 
+Example of updating a product variant
+
+```php
+$api = new BigCommerce\ApiV3\Client($_ENV['hash'], $_ENV['CLIENT_ID'], $_ENV['ACCESS_TOKEN']);
+
+$productVariant = $api->catalog()->product(123)->variant(456)->get()->getProductVariant();
+$productVariant->price = '12';
+
+try {
+    $api->catalog()->product($productVariant->product_id)->variant($productVariant->id)->update($productVariant);
+} catch (\Psr\Http\Client\ClientExceptionInterface $exception) {
+    echo "Unable to update product variant: {$exception->getMessage()}";
+}
+```
+
+Example of creating a product variant
+
+```php
+$api = new BigCommerce\ApiV3\Client($_ENV['hash'], $_ENV['CLIENT_ID'], $_ENV['ACCESS_TOKEN']);
+
+$productVariant = new \BigCommerce\ApiV3\ResourceModels\Catalog\Product\ProductVariant();
+$productVariant->product_id = 123;
+$productVariant->sku = "SKU-123";
+//...
+
+try {
+    $api->catalog()->product($productVariant->product_id)->variants()->create($productVariant);
+} catch (\Psr\Http\Client\ClientExceptionInterface $exception) {
+    echo "Unable to create product variant: {$exception->getMessage()}";
+}
+```
+
 ## Development
 
 Running tests: `composer run-script test`

src/BigCommerce/Api/Catalog/Products/VariantsApi.php

@@ -2,8 +2,9 @@
 
 namespace BigCommerce\ApiV3\Api\Catalog\Products;
 
-use BigCommerce\ApiV3\Api\Generic\ResourceApi;
 use BigCommerce\ApiV3\Api\Catalog\Products\ProductVariant\ProductVariantMetafieldsApi;
+use BigCommerce\ApiV3\Api\Generic\ResourceApi;
+use BigCommerce\ApiV3\ResourceModels\Catalog\Product\ProductVariant;
 use BigCommerce\ApiV3\ResponseModels\Product\ProductVariantResponse;
 use BigCommerce\ApiV3\ResponseModels\Product\ProductVariantsResponse;
 
@@ -38,6 +39,16 @@ public function getAll(array $filters = [], int $page = 1, int $limit = 250): Pr
         return new ProductVariantsResponse($this->getAllResources($filters, $page, $limit));
     }
 
+    public function create(ProductVariant $productVariant): ProductVariantResponse
+    {
+        return new ProductVariantResponse($this->createResource($productVariant));
+    }
+
+    public function update(ProductVariant $productVariant): ProductVariantResponse
+    {
+        return new ProductVariantResponse($this->updateResource($productVariant));
+    }
+
     public function metafield(int $metafieldId = null): ProductVariantMetafieldsApi
     {
         $api = new ProductVariantMetafieldsApi($this->getClient(), $metafieldId, $this->getResourceId());