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MATRIXX Business API SDK
Creating Extensions
You create extensions using a Maven archetype and then add those extensions to the RS Gateway as JAR files.
Example REST Tax Service
This section describes a project that implements a tax service.
Build and Deploy RS Gateway
When the custom extension is complete, build the project and deploy the .jar file to RS Gateway.

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MATRIXX Business API SDK
- About MATRIXX Business API SDK
  MATRIXX Business API SDK provides the APIs, libraries, and other files needed to create a customized version of the RS Gateway.
- Business API SDK Overview
  The Business API SDK is a flexible framework that includes a set of tools to manage, customize and extend Rest Services Gateway (RS Gateway) for customer-specific business needs. Using the SDK, you can extend existing projects or create entirely new projects to add, replace, or modify services that leverage existing functionality.
- Business API Gateway
  The Business API Gateway is a development framework that includes the Business API SDK, Rest Services Gateway (RS Gateway), Gateway Proxy, and application tier. It allows custom mobile applications, web clients, and other custom implementations to integrate with MATRIXX.
- Creating Extensions
  You create extensions using a Maven archetype and then add those extensions to the RS Gateway as JAR files.
  - Installing and Initializing the SDK
    Before beginning RS Gateway extension development, you must install the MATRIXX dependencies in the local Maven repository. Use the provided installation script or do it manually.
  - Creating a Project
    After you install the SDK dependencies, create a project using the MATRIXX Extension Maven archetype.
  - Defining the Extension
    Creating an extension involves multiple steps, including defining custom MATRIXX Data Containers (MDCs) from MATRIXX Engine and RS Gateway in the Extensions module MDC files, defining the REST APIs, and defining the routing rules.
  - Testing Extensions
    During extension development, test your code at different stages.
  - Deploying the Extension
    Each extension module described in the discussion about creating an extension has a JAR file which you deploy to the RS Gateway pod.
  - Creating Multi-Request REST Services
    This section describes how to create new services that are an orderly set of atomic SubMan multi-requests.
  - Example Offer Purchase Extension Project
    This section describes a project that creates a custom RS Gateway call that enhances offer purchasing. The project defines a custom offer purchase URL with a custom payload which returns balance impacts.
  - Example REST Tax Service
    This section describes a project that implements a tax service.
    - Creating the Tax Extension Directories
      In this section, you create a project directory to hold all Business API SDK files and your custom tax extension project files. The tax extension example assumes that you have already created a workspace for your extension projects.
    - Creating the Tax Service Custom MDCs
      In this section, you create the custom MATRIXX Data Containers (MDCs) to hold the custom tax data.
    - Creating the Tax Implementation Class
      In this task, you define the class that will service the REST request. This class would be responsible for computing the tax for the request and responding with the information in the response. The function defined here is simply a stub into which a developer could compute the actual tax.
    - Creating the Tax REST Service
      This section describes how to create the REST service that enables you to purchase a custom product offer.
    - Build and Deploy RS Gateway
      When the custom extension is complete, build the project and deploy the .jar file to RS Gateway.
- Creating Custom Filters
  You can create a custom filter by creating a named filter or a filter class. A named filter is useful for simple filters while a filter class should be used for complex filters (for example, when the returned results must be modified).
- Upgrading the Business API SDK
  When you upgrade the MATRIXX software, you must upgrade the Business API SDK as it is possible that files have changed or have been deprecated. Use the manage_integration_project.py script to remove the current release from your project directory structure and upgrade to the latest release. You should do this even if your files are not checked into Subversion.
- Appendixes
My MATRIXX Help
MATRIXX Backoffice Customer Tool Help
MATRIXX Third-Party Licenses
Glossary

Build and Deploy RS Gateway

When the custom extension is complete, build the project and deploy the .jar file to RS Gateway.

Procedure

Go to to the /mtxsdk/projects/thinAirTax directory.
Copy the extensions.jar file to the /opt/mtx/ext/common directory.
Edit the /opt/mtx/conf/extension-containers.yaml file.

Note: If this file does not exist, you must create it.
Add the MATRIXX Data Container (MDC) definition files to extension-containers.yaml.
For example:
```
extension-core: /extension-containers.yaml
Extension-rest: /extension-rest-mdc.xml
```
Copy the libraries or dependencies to the /opt/mtx/ext/common directory.
Build the project.
At the command prompt, type:
```
mvn clean install
```
Copy the rsgwextension.jar file to the /opt/mtx/ext/rsgateway directory.
Enter the following command to restart RS Gateway:
sudo systemctl restart mtx_rsgateway

What to do next

Make a POST call to test the new REST service in the custom RS Gateway. Use the following URL.

http://host:port/rsgateway/