curl --request POST \
  --url https://api-{dc}.moengage.com/v1.0/custom-templates/inapp/search \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "page": 1,
  "entries": 15,
  "template_source": [
    "API"
  ],
  "sort_params": [
    {
      "template_name": "ASCENDING"
    }
  ]
}
'

{
  "data": [
    {
      "external_template_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "version": 123,
      "basic_details": {
        "payload": "<string>",
        "preview_image": "<string>",
        "inapp_template_type": "SELF_HANDLED"
      },
      "meta_info": {
        "template_id": "<string>",
        "template_name": "<string>",
        "template_version": "<string>",
        "created_by": "<string>",
        "channel": "INAPP",
        "template_source": "API",
        "template_type": "CUSTOM"
      },
      "created_by": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_by": "<string>",
      "updated_at": "2023-11-07T05:31:56Z"
    }
  ]
}

{
  "error": {
    "code": "400 Bad Request",
    "message": "Validation failed because of invalid request data",
    "details": [
      {
        "code": "MissingValue",
        "target": "external_template_ids",
        "message": "external_template_id or version is missing in external_template_ids."
      }
    ],
    "request_id": "npmQrbNE"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": [
      {
        "code": "<string>",
        "target": "<string>",
        "message": "<string>"
      }
    ],
    "request_id": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": [
      {
        "code": "<string>",
        "target": "<string>",
        "message": "<string>"
      }
    ],
    "request_id": "<string>"
  }
}