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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/course/u21/public_html/staged/scripts/process_checkout.php:4 Stack trace: #0 /home/course/u21/public_html/staged/scripts/process_checkout.php(4): mysqli_query() #1 {main} thrown in /home/course/u21/public_html/staged/scripts/process_checkout.php on line 4