The top concern when you open a store on Shopify is to increase sales and then receive the money well. Paypal is increasing its reputation every year because of its security along with its convenience and many businesses prefer to use Paypal as their priority payment gateway.
If you want Synctrack - Add Tracking Auto to work perfectly, you need to insert a Client ID & Secret into the application to verify and proceed with adding tracking information to PayPal. It’s not a complicated but rather a crucial step.