User Story 13: As A powerPay User I will Like To check My balance using My SmartPhone

1.Description

2.Sequence Diagram

```mermaid
sequenceDiagram
participant u as User
participant s as Smart phone
participant ppa as PowerPay App
participant pps as PowerPay Service
u->>s:Communication
s->>ppa: Ask for balance check(PIN)
ppa->>pps:send(request and PIN)
pps->>pps:check for pin and account
pps-->>ppa:incorrect PIN(response)
ppa-->>s:incorrect PIN(reponse)
s-->>u:Dsplay(response)
pps-->>ppa:ok(balance)
ppa-->>s:ok(balance)
s-->>u:Dsplay(balance)

```

3.WireFrame


4.Ticket
Implement user pin input in the Frontend (PWA): A user should give his PIN to validate the check balance process
Implement OK screen in the Frontend (PWA): A user should see a his balance and can close the screen with the ok button.
* Implement the checkBalance(PN) function (REST API): Use PIN and Number to query balance for the corresponding account in the database.
* corresponding error code to the user. This function returns an error message by validating the users account if not present in the database