@startuml
title "P2U Wallet API"

boundary User_Page as up
participant Frontend_Server as fe
participant Backend_Server as be

autonumber

note over up
(1) GetBalance
end note

up->fe: MyBalance of MyPage or Checkout Page

note over fe
request
{ "TokenType": "MSQXP" }
end note
fe->be: /p2u-balance-get 

note over be
Get Current Balance for Tokens
end note

be->fe: current accout balance

note over fe
response
{"Balance": "13l4343000000000", 
  "UnitPoint": "12, 
  "DecimalPoint":"2"
  "TokenType": "MSQXP"
}

!! Balance should be string because
doesn't have bigNumber Format
end note

fe->up: show account balance

note over up:
note over up:

note over up
(2) Token Transfer
end note

up->fe: Checkout Page

note over fe
request
{
 "TokenType": "MSQXP"
 "FromAddr": "13l4343000000000", 
 "ToAddr": "13l4343000000000", 
 "TransactionAmt":"12340331000"
}
end note
fe->be: /p2u-transfer

note over be
Transger Tokens
end note

be->fe: Deduced accout balance

note over fe
response 
{"Balance": "13l4343000000000", 
  "UnitPoint": "12, 
  "DecimalPoint":"2"
  "TokenType": "MSQXP"
}
end note

fe->up: show transger result and deduced balance


@enduml