Peer-to-Peer Payment App Backend Template
Secure Transactions and Instant Transfers

Key Takeaways

Overview

A peer-to-peer payment product requires secure transaction handling, real-time balance visibility, and user collaborations.

This template models User, Transaction, Balance, and Notification with stringent security measures, allowing teams to implement payment systems swiftly.

Why Build Your Peer-to-Peer Payment Backend with Back4app?

Back4app simplifies payment processing by providing transaction primitives, allowing your team to focus on user engagement and financial transparency rather than infrastructure.

• •Transaction management: Transaction class with permissions for secure payments and balance management.
• •Real-time notifications and updates: Utilize real-time notifications for transaction updates, keeping users informed.
• •Flexible API access: Leverage both REST and GraphQL APIs for comprehensive client access and integrations.

Rapidly innovate and enhance peer-to-peer payment features with a unified backend model across all platforms.

Core Benefits

A peer-to-peer payment backend that empowers fast iteration without compromising on security.

Technical Stack

All components included in this peer-to-peer payment backend template.

ER Diagram

Entity relationship model for the peer-to-peer payment backend schema.

erDiagram
    User ||--o{ Transaction : "sender"
    User ||--o{ Transaction : "receiver"

    User {
        String objectId PK
        String username
        String email
        String password
        Number balance
        Date createdAt
        Date updatedAt
    }

    Transaction {
        String objectId PK
        Pointer sender FK
        Pointer receiver FK
        Number amount
        Date createdAt
        Date updatedAt
    }

Integration Flow

Standard runtime flow for authentication, transaction processing, balance updates, and user notifications.

sequenceDiagram
  participant User
  participant App as P2P Payment App
  participant Back4app as Back4app Cloud

  User->>App: Login
  App->>Back4app: POST /login
  Back4app-->>App: Session token

  User->>App: Send payment
  App->>Back4app: POST /classes/Transaction
  Back4app-->>App: Transaction details

  User->>App: Check balance
  App->>Back4app: GET /classes/User/objectId=BALANCE
  Back4app-->>App: Current balance

Data Dictionary

Full field-level reference for every class in the peer-to-peer payment schema.

Security and Permissions

How ACL and CLP strategies secure users, transactions, balances, and notifications.

Schema (JSON)

Raw JSON schema definition ready to copy into Back4app or utilize as an implementation reference.

{
  "classes": [
    {
      "className": "User",
      "fields": {
        "objectId": {
          "type": "String",
          "required": false
        },
        "username": {
          "type": "String",
          "required": true
        },
        "email": {
          "type": "String",
          "required": true
        },
        "password": {
          "type": "String",
          "required": true
        },
        "balance": {
          "type": "Number",
          "required": true
        },
        "createdAt": {
          "type": "Date",
          "required": false
        },
        "updatedAt": {
          "type": "Date",
          "required": false
        }
      }
    },
    {
      "className": "Transaction",
      "fields": {
        "objectId": {
          "type": "String",
          "required": false
        },
        "sender": {
          "type": "Pointer",
          "required": true,
          "targetClass": "User"
        },
        "receiver": {
          "type": "Pointer",
          "required": true,
          "targetClass": "User"
        },
        "amount": {
          "type": "Number",
          "required": true
        },
        "createdAt": {
          "type": "Date",
          "required": false
        },
        "updatedAt": {
          "type": "Date",
          "required": false
        }
      }
    }
  ]
}

API Playground

Try REST and GraphQL endpoints against the peer-to-peer payment schema. Responses utilize mock data and do not require a Back4app account.

Utilizes the same schema as this template.

What You Get with Every Technology

Every stack utilizes the same peer-to-peer payment backend schema and API contracts.

Frequently Asked Questions

Common inquiries surrounding the development of a peer-to-peer payment backend using this template.