curl --request POST \
  --url https://developer.worldcoin.org/api/v2/create-action/{app_id} \
  --header 'Content-Type: application/json' \
  --data '{
  "action": "<string>",
  "name": "<string>",
  "description": "<string>",
  "max_verifications": 1
}'

{
  "action": {
    "action": "<string>",
    "name": "<string>",
    "description": "<string>",
    "max_verifications": 123,
    "external_nullifier": "<string>"
  }
}