Integrate with SAP Ariba procurement APIs

Steps

1. Register an application in the SAP Ariba Developer Portal, select the required API (e.g., Procurement, Sourcing, or Supplier), and obtain the OAuth 2.0 client credentials (client ID and secret) along with the API key.
2. Obtain an access token by POST-ing to the Ariba OAuth token endpoint with grant_type=client_credentials, client_id, client_secret, and the appropriate scope for the target API.
3. Include both the Authorization: Bearer YOUR_TOKEN header and the apiKey query parameter (or header, depending on the specific API) in all requests; the apiKey identifies the application to the Ariba API gateway.
4. Call the desired resource endpoint, e.g. /api/procurement/v1/purchaseOrders for purchase orders, using standard query parameters for filtering and pagination as documented per API product.
5. Respect the realm parameter required by some Ariba APIs — it identifies the customer's Ariba site and must be appended as a query parameter (realm=YOUR_REALM) or configured in the application settings.