Accessing the Oracle NetSuite REST API with PowerShell

This repository contains a PowerShell script for authenticating and accessing the Oracle NetSuite REST API using OAuth 2.0 Machine 2 Machine Client Credentials flow. The script demonstrates how to generate a JWT, sign it, obtain an access token, and make authenticated API requests to NetSuite.

Prerequisites

• PowerShell 6 (Core) or later
  (Windows PowerShell is not supported; use PowerShell Core)
• An Oracle NetSuite account with API access enabled
• OAuth 2.0 Client Credentials integration set up in NetSuite
• Access to your integration's certificate/private key in PEM format

Usage

1. Clone this repository or download the script:

   git clone https://github.com/jascomp/oracle-netsuite-rest-api-powershell.git

2. Edit the script:
   Open oracle-netsuite-rest-api.ps1 and update the following placeholders:

   • [Certificate ID from OAuth 2.0 Client Credentials Setup]
   • [Client ID provided during Integration Setup]
   • <accountID>
   • <File path to public.pem>
   • Any other relevant fields in the script

3. Run the script:

   ./oracle-netsuite-rest-api.ps1

4. Expected Output:
   If configured correctly, the script will:

   • Generate and sign a JWT
   • Obtain an OAuth access token from the NetSuite token endpoint
   • Use the token to make a sample GET request (e.g., retrieving a customer record)
   • Print the API response in JSON format

Important Notes

• Oracle has phased out support for PKCSv1.5 for RSA signatures. You must now use PSS. If you continue to use PKCSv1.5 the service will return invalid_grant.

Reference

For a full explanation of the process and script walkthrough, see the accompanying blog post:
Accessing Oracle NetSuite REST API Using PowerShell