1.) Sign up for Stripe https://dashboard.stripe.com/register or Login https://dashboard.stripe.com/login

2.) Go to "Home" (1) and copy "Publishable key" to "Stripe Public Key" and copy "Secret key" to "Stripe Secret Key" (2)

"Stripe Public Key" and "Stripe Secret Key" located in the admin panel, section "Payments Settings"

3.) To exit the test mode and activate real payments - activate payments (button "Activate" (3) in the picture above)