Before you can send requests for CyberSource REST API services that are authenticated using a JSON web token, you must create a .P12 certification for your CyberSource merchant account in the Business Center.
The certificate contains both the public and private key.
To create a P12 certificate:
  1. Log in to the Business Center.
    Production Environment: businesscenter.cybersource.com
  2. On the left navigation panel, click the
    Payment Configuration
     icon.
  3. Click
    Key Management
    .
    The Key Management page appears.
  4. Click
    Generate Key
    .
    The Create Key page appears.
  5. Select
    REST Certificate
    .
  6. Click
    Download key
     to download the certificate.
Now you are ready to generate the header.