List Videos in a WeChat Channels Collection

{
  "type": "object",
  "required": [
    "body"
  ],
  "properties": {
    "body": {
      "type": "object",
      "title": "FetchCollectionVideosRequest",
      "required": [
        "topic_id"
      ],
      "properties": {
        "raw": {
          "type": "boolean",
          "title": "Raw",
          "default": true,
          "description": "True returns the raw response; False returns a simplified, parsed structure, recommended for media downloads."
        },
        "topic": {
          "anyOf": [
            {
              "type": "string",
              "maxLength": 100
            },
            {
              "type": "null"
            }
          ],
          "title": "Topic",
          "default": "",
          "example": "早安中国",
          "description": "Optional collection name, which can improve matching."
        },
        "topic_id": {
          "type": "string",
          "title": "Topic Id",
          "example": "14616794565351966924",
          "pattern": "^[0-9]+$",
          "maxLength": 32,
          "description": "Numeric collection ID from topic_id returned by fetch_user_collections."
        },
        "username": {
          "anyOf": [
            {
              "type": "string",
              "pattern": "^(v2_[0-9a-fA-F]+@finder)?$",
              "maxLength": 256
            },
            {
              "type": "null"
            }
          ],
          "title": "Username",
          "default": "",
          "example": "v2_060000231003b20faec8c6e4811dc1d4c602ee30b0771bbcf220c67926bb76ab7702ac335a53@finder",
          "description": "Optional creator finder username, which can improve matching."
        },
        "topic_type": {
          "type": "integer",
          "title": "Topic Type",
          "default": 16,
          "maximum": 1000,
          "minimum": 0,
          "description": "Collection type; defaults to 16 and aligns with topic_type from fetch_user_collections."
        },
        "last_buffer": {
          "anyOf": [
            {
              "type": "string",
              "pattern": "^[A-Za-z0-9+/=_-]*$"
            },
            {
              "type": "null"
            }
          ],
          "title": "Last Buffer",
          "default": "",
          "description": "Base64 pagination cursor; leave empty for the first page."
        }
      },
      "x-readme-ref-name": "FetchCollectionVideosRequest"
    },
    "queryParams": {
      "type": "object",
      "properties": {},
      "additionalProperties": true
    }
  },
  "additionalProperties": false
}