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PHP Build a Simple PHP Application Integrating with PayPal Creating Paypal Buttons

Unable to add item to cart on paypal site

I am trying to add a shirt of say large to cart. I am not getting the output page on paypal showing me the shopping cart with the pricing info. I see an error stated like this below.

Sorry — your last action could not be completed If you were making a purchase or sending money, we recommend that you check both your PayPal account and your email for a transaction confirmation after 30 minutes.

If you came to this page from another website, please return to that site (don't use your browser's Back button) and restart your activity.

If you came from PayPal's website, click the PayPal logo in the upper-left corner to return to our home page and restart your activity. You might have to log in again.