I'm testing paypal express checkout, but got the following error messgae
We are sorry for the inconvenience. The PayPal account in this store is presently misconfigured to use mixed sandbox and live settings. We are unable to complete your transaction. Please notify the store owner so they can correct this problem. (10002) 10002 Security error - Security header is not valid
I don't know what does this mean?
Can someone help me? Thanks in advance~
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