API Overview

Getting Started with REST Developer Guide
- Recent Revisions to This Document

Introduction to REST

Overview of How to Set Up Your National Australia Bank Account

Set Up a JSON Web Token Message Using P12 Certificates
- Step 1: Sign Up for a Sandbox Account
- Step 2: Create or Submit a P12 Certificate
- Step 3: Construct Messages Using JSON Web Tokens
- Step 4: Enable Message-Level Encryption
- Step 5: Test Your Setup
- Step 6: Going Live

Set Up a JSON Web Token Message Using Shared Secret Keys
- Step 1: Sign Up for a Sandbox Account
- Step 2: Create a Shared Secret Key Pair
- Step 3: Construct Messages Using JSON Web Tokens
- Step 4: Enable Message-Level Encryption
- Step 5: Test Your Setup
- Step 6: Going Live

Set Up an HTTP Signature Message [DEPRECATING]
- Step 1: Sign Up for a Sandbox Account
- Step 2: Create a Shared Secret Key Pair
- Step 3: Construct Messages Using HTTP Signature Security
- Step 4: Test Your Setup
- Step 5: Going Live

On This Page

Prerequisites for MLE

Before you can set up message-level encryption (MLE), you must complete these requirements:

Verify that your system is configured to read the public key and encrypt the API payload.

Verify that you have a P12 certificate and extracted its private key. For more information, see Create or Submit a P12 Certificate.

Verify that your system can construct JWTs. For more information, see Construct Messages Using JSON Web Tokens.

WARNING

As of February 2026
, there are new requirements for constructing a JWT. By September 2026
, merchants must update their system to support the new JWT construction. Merchants who do not update their system to support this requirement risk transaction failure.

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