Two steps, the easist way to integrate with shopify.

1. System setting, switch on "Order/Product API"

"Company setting" -> "Payment gateway" -> "Order/Product API"

Config "Shipify customer ID"

2. Shopify configuration

"Settings" -> "Notifications" -> "Webhooks"

"Create webhooks", Fill with API URL.

Note: Please contact us if you would like to get more info.