Problem with Shopify integration

[soboutipour]

Hello,

I have a problem in using PayPal express checkout to my Shopify shop.

I have added it successfully and everything seems to be fine and the status is active, but when I want to test this checkout on my shop, after selecting the PayPal button, I receive the following error message:

"There was an issue with PayPal. Try again or use a different payment method."

and no other explanations are provided.

does anybody know the problem and solution?

Thanks