Solution!!:) Solution! Solution!! Do this- (Note- if your shopify E-mail address is different than Paypal address first add that shopify address in paypal and make it default . Now follow given steps.) Login to your paypal business. Settings:setting tools : API Access click update. On pre-built payment solution click manage third party access. There is a third party username of shopify just choose and remove from dropdown box. Logout from paypal. Come back to shopify payment page and now follow the steps to connect paypal express check out. This time it will ask you to enter paypal login id password, accept all the paypal permission it asks and click on back to shopify, Let the page fetch paypal data and more;)
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