When attempting to set up integration between Point of Sale and QuickBooks, you see the following message:
QuickBooks application with invalid certificate. An application with an invalid certificate has requested access to the following QuickBooks company file [company name]. The application calls itself QuickBooks Point of Sale. Certificate info: the certificate is invalid.
This message is followed by:
QuickBooks Point of Sale does not have permission to access the company file you specified.
Digital signature components may be damaged.
Note: If the error persists, uninstall and reinstall Point of Sale and repeat the above steps.