curl --request POST \
  --url https://us.infisical.com/api/v1/app-connections/external-infisical \
  --header 'Content-Type: application/json' \
  --data '
{
  "method": "machine-identity-universal-auth",
  "credentials": {
    "instanceUrl": "<string>",
    "machineIdentityClientId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "machineIdentityClientSecret": "<string>"
  },
  "name": "<string>",
  "description": "<string>",
  "projectId": "<string>",
  "isPlatformManagedCredentials": false,
  "gatewayId": "<unknown>",
  "gatewayPoolId": "<unknown>",
  "isAutoRotationEnabled": false,
  "rotation": "<unknown>"
}
'

{
  "appConnection": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "<string>",
    "orgId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z",
    "app": "external-infisical",
    "method": "machine-identity-universal-auth",
    "credentials": {
      "instanceUrl": "<string>",
      "machineIdentityClientId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
    },
    "description": "<string>",
    "version": 1,
    "isPlatformManagedCredentials": false,
    "gatewayId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "projectId": "<string>",
    "isAutoRotationEnabled": false,
    "gatewayPoolId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "rotation": {
      "rotationInterval": 123,
      "rotateAtUtc": {
        "hours": 123,
        "minutes": 123
      },
      "lastRotationMessage": "<string>",
      "nextRotationAt": "2023-11-07T05:31:56Z"
    },
    "credentialsHash": "<string>",
    "project": {
      "name": "<string>",
      "id": "<string>",
      "type": "<string>",
      "slug": "<string>"
    }
  }
}