ML-Cross Scheme.wsd

@startuml
participant "Payer DFSP" as PAYER
participant "Mojaloop - Sender" as MLS
participant "Sender Proxy" as SP
participant "Mojaloop - Regional" as MLHUB
participant "Receiver Proxy" as RP
participant "Mojaloop - Receiver" as MLR
participant "Payee DFSP" as PAYEE

title "Regional Hub model"

autonumber 1 

PAYER -> MLS: POST /transfers
MLS --> PAYER: http/202
MLS -> MLS: Block funds of Sending DFSP
MLS -> SP: POST /transfers
SP --> MLS: http/202
SP -> MLHUB: POST /transfers
MLHUB --> SP: http/202
MLHUB -> MLHUB: Block Funds of\nSending Scheme
MLHUB -> RP: POST /transfers
RP --> MLHUB: http/202
RP -> MLR: POST /transfers
MLR --> RP: http/202
MLR -> MLR: Block funds of \nProxy
MLR -> PAYEE: POST /transfers
PAYEE --> MLR: http/202
PAYEE -> PAYEE: Validate if account\ncan accept credit\nReserve
PAYEE -> MLR: PUT /transfers\n(transferstate="Reserved")
MLR --> PAYEE: http/200
MLR -> MLR: Hold Posting\nto Central Ledger\nWait for Commit Notification
MLR -> RP: PUT /transfers\n(transferstate = "Reserved")
RP --> MLR: http/200
RP -> MLHUB: PUT /transfers\n(transferstate = "Reserved")
MLHUB --> RP: http/200
MLHUB -> MLHUB: Commit Transfer from\nSender Proxy to\nReceiver Proxy\nGuarantee Settlement
par Payee Side
    MLHUB -> RP: PATCH /transfers\n(transferstate=COMMITTED)
    RP --> MLHUB: http/200
    RP -> MLR: PATCH /transfers(transferstate=COMMITTED)
    MLR --> RP: http/200
    MLR -> MLR: Complete Posting\nRP to Payee
    note right of MLR: Posting only after\nRegional Hub commits
    MLR -> PAYEE: PUT /transfers\n(transferstate=COMMITTED)
    PAYEE --> MLR: http/200
    note right of PAYEE: Credit customer   
else Payer Side
    MLHUB -> SP: PUT /transfers\n(transferstate=COMMITTED)
    SP --> MLHUB: http/200
    SP -> MLS: PUT /transfers\n(transfersstate=COMMITTED)
    MLS --> SP: http/200
    MLS -> PAYER: PUT /transfers\n(transferstate=COMMITTED)
    PAYER --> MLS: http/200
    note left of PAYER: Payer gets\nsuccess
end