### 交易渠道表
> channel_name: 渠道名称
> 
> channel_code: 渠道代码
>
> area ： 区域代码（英文）国家级行政单位，来自[area.area_en](./area.md)
> 
> supported_currencies : 支持的币种代码id,多个币种id的数组json字符[currency.currency_id](./currency.md) 如`[840,978,..]`
>
> config :保存json配置信息,如 微信需要保存app_id,secret

```mysql
CREATE TABLE `channel` (
    `id` int NOT NULL AUTO_INCREMENT,
    `channel_id` bigint DEFAULT NULL,
    `channel_code` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL,
    `channel_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '通道名称',
    `docking_method` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '对接方式',
    `channel_type` int DEFAULT NULL,
    `area` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '区域',
    `support_currencies` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '支持的币种',
    `config` tinytext CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci COMMENT '保存json配置信息',
    `state` int DEFAULT NULL,
    `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
    `updated_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '修改时间',
    `deleted_at` datetime NOT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '修改时间',
    PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci ROW_FORMAT=DYNAMIC;
```