curl --request PUT \
  --url https://realtime-api.voiceflow.com/v2/stable/workflow/<workflowID>/step/<stepID>/link/<portKey> \
  --header 'Authorization: Bearer <token>'
  --header 'Content-Type: application/json' \
  --data '{
  "toBlockID": "<string>"
}'

const response = await fetch('https://realtime-api.voiceflow.com/v2/stable/workflow/<workflowID>/step/<stepID>/link/<portKey>?projectID=<projectID>&environmentAlias=<environmentAlias>', {
  method: 'PUT',
  headers: {
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "toBlockID": "<string>"
  }),
});
const data = await response.json();

import requests

response = requests.put(
    'https://realtime-api.voiceflow.com/v2/stable/workflow/<workflowID>/step/<stepID>/link/<portKey>?projectID=<projectID>&environmentAlias=<environmentAlias>',
    headers={'Authorization': 'Bearer <token>'},
    json={
      "toBlockID": "<string>"
    },
)
data = response.json()

vf workflow link --workflow-id <workflowID> --step-id <stepID> --port-key <portKey> --project-id <projectID> --environment-alias <environmentAlias> \
  < body.json