Install gcloud CLI
Follow the instructions here.
To try out the Google Vertex AI text endpoint:
curl -X POST \
-H "Authorization: Bearer $(gcloud auth print-access-token)" \
-H "Content-Type: application/json; charset=utf-8" \
-d @request.json \
"https://us-central1-aiplatform.googleapis.com/v1/projects/__PROJECT_ID__/locations/us-central1/publishers/google/models/text-bison:predict"