PHP Shopify embeded app
php -S localhost:8000
./ngrok http 8000
Create new app in Shopify (Check embedded app and add Apps urls).
Add API Creds in config.lib.php.
Add ngrok authorize URL in authorize.php. eg: https://xxxxxxx.ngrok.io/authorize.php.
Go to https://xxxxxxx.ngrok.io/ and enter store url xxxxxxx.myshopify.com.