Connection with Opengate data streams

I want to connect with a database from Opengate. I have this instructions, can you help me?

curl --request POST \
     --header "X-ApiKey: YOUR_API_KEY_HERE" \
     --header "Content-type: application/json" \
     --data-binary @opengate-north-iot-datastreams-filter-example.json \
     --verbose \
     http://[your_opengate_address]/north/v80/search/datastreams