I'm just about ready to launch a small store hosted on BlueHost. Using the latest WooCommerce v1.6.1 using PayPal Pro for the processing. Currently, I'm in sandbox mode. I go to checkout, fill out all necessary information, hit submit but the order doesn't go through. Instead I get this error message:
Payment error: Security header is not valid
Is this because I'm in Sandbox mode? Or it is something on Bluehost's end? I'd like to get this solved so I can make this site live, but I don't know why this would be happening.