In order to use this feature, you will first need to enable Amex Express Checkout in the Control Panel.
- Log into the Control Panel
- Click on the gear icon in the top right corner
- Click Processing from the drop-down menu
- Scroll to the Payment Methods section
- Next to Amex Express Checkout, click the Enable button
- Complete the signup form
- Click the Submit button
After submitting the signup form, you will be redirected to a configuration page containing your
client_key, which you’ll need in order to configure the Amex Express Checkout tag on your checkout page.
You’ll need to follow the same steps in your sandbox account in order to test your integration.