User actions across apps

curl --request POST \
  --url https://api.neynar.com/v2/farcaster/action \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "signer_uuid": "123e4567-e89b-12d3-a456-426614174000",
  "base_url": "https://example.com",
  "action": {
    "type": "create.user",
    "payload": {}
  }
}'

{}