cURL error 60 : SSL problem

Go to http://curl.haxx.se/ca/cacert.pem and download the pem file and save in your php installation directory ( make sure while saving it retains the extension and not saved as a text file )

Now, open your php.ini file, scroll to the bottom and add the following line:

[cURL]
curl.cainfo="D:\xampp\php\cacert.pem"
Replace D:\xampp\php\cacert.pem with the actual path.

payload is invalid

When you copied the whole project and start working again, it would say payload is invalid in all calls

php artisan key:generate

php artisan config:cache