Today I was trying to set up my paypal account so that

Today I was trying to set up my paypal account so that I may take credit card transactions for the purchase of membership subscriptions. We set up everything on paypal website including a sandbox transaction. Now or customers want to pay with paypal but it still redirects to sand box payment page. We called paypal and we spoke with the technician from there and they said it is a plugin issue. Paypal mode is on live site. What assistance can you provide to resolve this ???