<bisURL> refers to the PowaAim server you are working with. Possible values are:
aim-sb1.powa.com - Aim Sandbox 1
aim-sb2.powa.com - Aim Sandbox 2
prod-euw1-aim.powa.com - Live/Production
<shopID> refers to your given shopID (that we've provided you)
<productID> is the unique ID / SKU to reference each product
<shopURL> is constant for all endpoints. <shopURL> is the URL where the merchant’s store resides. This may be a simple domain name (myshop.com), a domain with prefix (www.myshop.com), or a domain with path (www.myshop.com/catalog).