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Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in /home/one9/public_html/stp/decline-on-card-authentication/server/php-slim/index.php on line 7

Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='.:/opt/cpanel/ea-php73/root/usr/share/pear') in /home/one9/public_html/stp/decline-on-card-authentication/server/php-slim/index.php on line 7