AITpro on "[Plugin: BulletProof Security] 403 error after PayPayl payment"

Do these steps.
Put the root htaccess file in Default Mode.
Go to BPS Custom Code and double check all Custom Code text boxes.
The Query String Exploits code should only be in this Custom Code text box: CUSTOM CODE BPSQSE BPS QUERY STRING EXPLOITS.
If you see the Query String Exploits code in any other Custom Code text boxes then delete it.
Then click the Save Root Custom Code button.
Go to the Security Modes page, click the Create secure.htaccess File AutoMagic button and activate Root folder BulletProof Mode.