curl --request POST \
  --url https://api.iotools.cloud/v1/tool/env-var-template-expander \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "templateInput": "server:\n  host: ${DB_HOST}\n  port: ${DB_PORT}\n  name: ${DB_NAME}\n\napi:\n  key: {{API_KEY}}\n  url: {{API_URL}}\n\nbuild:\n  version: %APP_VERSION%\n  env: %APP_ENV%\n\nmissing: ${UNDEFINED_VAR}",
  "envInput": "# Database\nDB_HOST=localhost\nDB_PORT=5432\nDB_NAME=myapp\n\n# API\nAPI_KEY=sk_test_abc123\nAPI_URL=\"https://api.example.com\"\n\n# App\nAPP_VERSION=1.4.2\nAPP_ENV=production",
  "syntaxMode": "auto",
  "unresolvedBehavior": "leave",
  "caseSensitive": "true"
}
'

{
  "tool": "env-var-template-expander",
  "tool_version": "1.0.1",
  "outputs": {
    "expandedOutput": "server:\n  host: localhost\n  port: 5432\n  name: myapp\n\napi:\n  key: sk_test_abc123\n  url: https://api.example.com\n\nbuild:\n  version: 1.4.2\n  env: production\n\nmissing: ${UNDEFINED_VAR}",
    "summary": [
      {
        "metric": "Variables loaded",
        "value": "7"
      },
      {
        "metric": "Resolved substitutions",
        "value": "7"
      },
      {
        "metric": "Unresolved variables",
        "value": "1"
      }
    ],
    "unresolved": [
      {
        "variable": "UNDEFINED_VAR",
        "occurrences": "1"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}