Marshal turns a struct to map[string]interface.

ColumnPayParams saves SDKParams to a SQL JSON column.

JSApiParams creates an order when user is trying to pay inside wechat's embedded browser.

JSApiParamsJSON is used to implement Marshaller interface to avoid cyclic call of MarshalJSON.

OrderParams lists all request parameters sent to https://api.mch.weixin.qq.com/pay/unifiedorder.

OrderParamsCommon collects the essential fields to create a new order for ftc.

PayParams contains all parameters required to cal wechat pay on every platform.

Source corresponds to wechat's `trade_type` fields.