I am coming from Malaysia too. Not all Malaysian has paypal account. Even to edit the paypal account is nightmare to me. Even with this link https://help.shopify.com/en/manual/payments/paypal/set-up-paypal. I have been trying hours and days without successful. Until Now, I cannot add my merchant id and password. Contact the support shopify . Just issue a ticket no, now more than 24 hours nothing has been done. Really stressful without Livechat like Namecheap.com. I tried adding 2checkout, with some alien documents to fill in.