Fix check variant helper

Author: Guy Marriott

.github/workflows/changelog-template.txt

@@ -0,0 +1,4 @@
+See the release on NPM: https://www.npmjs.com/package/@chec/react-commercejs-hooks
+
+## Changelog
+

.github/workflows/publish.yml

@@ -0,0 +1,39 @@
+name: Publish
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Enter a valid semver version'
+        required: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-node@v2
+        with:
+          node-version: '14.x'
+          registry-url: 'https://registry.npmjs.org'
+      - name: Setup Git
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+      - run: yarn install
+      - run: yarn build
+      - run: npm version ${{ github.event.inputs.version }}
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+      - run: 'git push origin master;git push --tags'
+      # Create a release with a changelog
+      - name: Create changelog from git log
+        run: git log --oneline --pretty=format:"* %s (%an) - %h" --no-merges $(git describe --abbrev=0 HEAD^)..HEAD~1 >> .github/workflows/changelog-template.txt
+      - name: Create release
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: v${{ github.event.inputs.version }}
+          body_path: .github/workflows/changelog-template.txt

src/checkout/useCheckVariant.ts

@@ -16,7 +16,7 @@ export default function useCheckVariant() {
         checkout.id,
         lineItemId,
         {
-          variant_id: variantId,
+          group_id: variantId,
           option_id: optionId,
         },
       ).then((result: any) => {