To enable Littledata to add server-side events into your Data Stream (via the Measurement Protocol API), you then need to create a new Measurement Protocol API secret for your Data Stream:
First, go to your Google Analytics Admin > Data collection and modification > Data Streams and open your chosen stream:
Scroll down to the Events tab and click on Measurement Protocol API secrets; then click Create:
You will have to create a nickname for your new API secret; we recommend naming this Littledata. Click Create
You will need to copy the Secret value provided. This value is confidential and should only be shared with Littledata.
All done!