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API username error - Checkout error
We started using the PayPal Express Checkout Button a few days ago, and today we realized that we have not been receiving payment from sales through our website. Paypal shows all payment transactions as "Expired" and they say that is because maybe the API Username is not working well.
Also we tested our webstore using the standard checkout but it shows error!
"Our Web site is temporarily unavailable while we perform routine system maintenance. We are working on the site to improve its appearance and functionality.
We sincerely apologize for the inconvenience. Please visit us again later."
We really need your help, we are losing sales!