Thank you for replying but I believe this link is not the same issue, what I mean, I have two websites, site (A) & site (B), for example, and both are integrated with one PayPal business account, and each one has individual Paypal plugin, when I have purchased from website (B) buyer receives the bank transaction message and Paypal payment message labeled with the site (A)which is the same Paypal account name rather than (B).
note that the client ID and secret key are different on each site but the merchant ID is the same because its A unique for the business Paypal account.I hope you know now what I mean`