Shopify CMS backend based on the Yii 2 extensions yii2-cms and yii2-shopify.

• Make sure app\modules\admin\widgets\forms\EntryActiveForm::$fields includes product_id to display the entries drop down
• [Optional] Use davidhirtz\yii2\cms\shopify\widgets\grid\columns\ProductIdColumn to display an entries counter in davidhirtz\yii2\cms\modules\admin\widgets\grid\EntryGridView

See also the instructions in the yii2-shopify package to set up the Shopify store.