Full-page checkout flow testing
1. Create a session with mode: 'redirect'
2. Redirect user to the redirectUrl
3. User completes payment on hosted checkout page
4. User is redirected back to your successUrl or cancelUrl
{SESSION_ID}, {CHARGE_ID}
{SESSION_ID}
Visa: 4012002000060016
CVV: Any 3 digits
Expiry: Any future date
ZIP: Any 5 digits