i am trying to integrate square payments php api in my website, i am using this source i have followed all the steps but it gives me an error when i proceed to payment after inputting all the card details, the console shows /process payment 404 not found, like the one shown below
the payment process file is already in the folder, only change i made from the source is that i used "composer install" instead of "composer.phar install" because that was not working.
can anyone please help on what should be done?