You can import the proxy bundles from your trail account, by following these instructions: https://cloud.google.com/apigee/docs/api-platform/fundamentals/download-api-proxies#upload For testing purposes, if the hostname/IP of your SAP NW GW is access...

Since SAP Gateway exposes OData over HTTP/S, it is pretty straightforward to expose that through Apigee (assuming the network connectivity between Apigee and SAP GW has already been established). Generally speaking, there are two high level use cases...