curl --location '/merchant-api/v1/dev/im/mock-buyer/bootstrap?userId=undefined&userName=undefined' \
--header 'Authorization: Bearer jl-test-token-user-43'{
"code": 0,
"message": "string",
"data": {
"sdkAppId": 0,
"userId": "string",
"userSig": "string",
"expireAt": 0,
"userName": "string",
"avatar": "string"
}
}