How to integrate Paypal payment gateway to Shopify E-Commerce store.
1. At Setting - Payment , choose Paypal Express Checkout for Thailand.
2. Grant permission for Paypal by clicking the blue button.
3. The screenshot show that you granted Paypal to integrate with Shopify. Click back to Shopify button.
4. You can see that you have finished integrate Paypal with your Shopify online store.