@startuml
participant 商户_merchant
participant 商户外部账户merchant_account_out
participant 商户系统账户merchant_account_sys


商户_merchant -> 商户外部账户merchant_account_out: 1. 发起支付请求
商户_merchant -> 商户系统账户merchant_account_sys: 1. 发起支付请求


@enduml