3.1. Merchant backend API

• 3.1.1. Conceptual overview
• 3.1.2. Protocol versioning
• 3.1.3. Creating orders
• 3.1.4. Refunding orders
• 3.1.5. Understanding fulfillment URLs
• 3.1.6. The Taler Order Format
• 3.1.7. Session-Bound Payments