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API Implementation Summary

✅ Complete API Client Implementation

Successfully implemented a comprehensive, type-safe API client for the PayNote application based on the OpenAPI 3.0 specification.

Directory Structure

frontend/paynote/src/api/
├── index.ts                    # Main exports & unified API object
├── README.md                   # Complete documentation & examples
├── lib/
│   ├── http.ts                # HTTP client with timeout & error handling
│   └── errors.ts              # ApiError & RateLimitError classes
├── routes/
│   ├── networks.ts            # GET /networks
│   ├── organizations.ts       # CRUD for organizations & accounts
│   ├── wallets.ts             # GET /wallets (with filters)
│   ├── categories.ts          # List & create categories
│   ├── rules.ts               # List & create automation rules
│   ├── counterparties.ts      # List counterparties (with type filter)
│   ├── bindings.ts            # Contract bindings by chain/org
│   ├── paynotes.ts            # PayNotes list & detail
│   ├── analytics.ts           # Daily analytics aggregates
│   ├── fx-snapshots.ts        # Exchange rate data
│   ├── search.ts              # Unified search
│   └── attachments.ts         # Attachment metadata creation
└── types/
    └── requests.ts            # Request DTOs (Create/Update types)

Implemented API Endpoints (14 Route Modules)

1. Networks API (networks.ts)

  • ✅ GET /networks - List all supported blockchain networks

2. Organizations API (organizations.ts)

  • ✅ GET /orgs - List user's organizations
  • ✅ POST /orgs - Create organization
  • ✅ GET /orgs/{orgId} - Get organization by ID
  • ✅ PATCH /orgs/{orgId} - Update organization
  • ✅ DELETE /orgs/{orgId} - Delete organization
  • ✅ GET /orgs/{orgId}/accounts - List organization members

3. Wallets API (wallets.ts)

  • ✅ GET /wallets - List wallets (filter by ownerAccountId or address)

4. Categories API (categories.ts)

  • ✅ GET /orgs/{orgId}/categories - List categories
  • ✅ POST /orgs/{orgId}/categories - Create category

5. Rules API (rules.ts)

  • ✅ GET /orgs/{orgId}/rules - List automation rules
  • ✅ POST /orgs/{orgId}/rules - Create rule

6. Counterparties API (counterparties.ts)

  • ✅ GET /orgs/{orgId}/counterparties - List counterparties (filter by type)

7. Contract Bindings API (bindings.ts)

  • ✅ GET /bindings - List contract bindings (filter by chainId or orgId)

8. PayNotes API (paynotes.ts)

  • ✅ GET /paynotes - List transactions (filter by chainId, address, categoryId, orgId)
  • ✅ GET /paynotes/{payNoteId} - Get transaction detail

9. Analytics API (analytics.ts)

  • ✅ GET /analytics/daily - Daily aggregates (filter by orgId, date range, chainId)

10. FX Snapshots API (fx-snapshots.ts)

  • ✅ GET /fx-snapshots - Exchange rate snapshots (filter by base currency, timestamp)

11. Search API (search.ts)

  • ✅ GET /search - Unified search (filter by query, orgId, docType)

12. Attachments API (attachments.ts)

  • ✅ POST /orgs/{orgId}/attachments - Create attachment metadata

Core Features

HTTP Client (lib/http.ts)

  • ✅ Automatic JSON serialization/deserialization
  • ✅ Query parameter building
  • ✅ Request timeout (default 30s, configurable)
  • ✅ Typed error handling with Problem Details (RFC 7807)
  • ✅ AbortController for cancellation
  • ✅ Helper methods: get, post, patch, put, delete

Error Handling (lib/errors.ts)

  • ✅ ApiError class with helper methods:
    • is(status) - Check specific HTTP status
    • isAuthError() - Check if 401
    • isForbidden() - Check if 403
    • isNotFound() - Check if 404
    • isConflict() - Check if 409
    • isValidationError() - Check if 400/422
    • getFieldErrors() - Extract field-level validation errors
  • ✅ RateLimitError class with retryAfterSeconds property

Request DTOs (types/requests.ts)

  • ✅ OrganizationCreate - Create organization payload
  • ✅ OrganizationUpdate - Update organization payload
  • ✅ CategoryCreate - Create category payload
  • ✅ RuleCreate - Create rule payload
  • ✅ AttachmentCreate - Create attachment metadata payload

Type Safety

All API methods are fully typed using the entity types from src/types/:

// Primitives
UUID, Address, ENSName, Bytes32, TxHash, ChainId, Wei, UnixTime, 
FiatCode, HexColor, IconKey, Slug, URLString, Email, FileId

// Enums
Role, Plan, Visibility, CPType, Status, DocType

// Interfaces
Network, Organization, Account, Wallet, Category, Rule, 
Counterparty, ContractBinding, Attachment, PayNote, 
PayNoteExpanded, AnalyticsDaily, ExchangeRateSnapshot, 
SearchIndex, ProblemDetail

Usage Examples

Basic Import

import { api } from "@/api";

// All endpoints available via unified object
const networks = await api.networks.list();
const org = await api.organizations.get(orgId);
const paynotes = await api.paynotes.list({ chainId: 1 });

Error Handling

import { api, ApiError, RateLimitError } from "@/api";

try {
  const result = await api.organizations.create(data);
} catch (error) {
  if (error instanceof RateLimitError) {
    // Handle rate limit
  } else if (error instanceof ApiError) {
    if (error.isValidationError()) {
      const fieldErrors = error.getFieldErrors();
      // Display validation errors
    }
  }
}

In React Components

"use client";
import { useEffect, useState } from "react";
import { api } from "@/api";

export function Component() {
  const [data, setData] = useState([]);
  
  useEffect(() => {
    api.paynotes.list().then(setData);
  }, []);
  
  return <div>{/* render data */}</div>;
}

Integration with Existing Pages

The API client can now be integrated into all the pages created in the previous steps:

Explore Page (/explore)

const paynotes = await api.paynotes.list({ chainId, categoryId });
const networks = await api.networks.list();
const categories = await api.categories.list(orgId);

Dashboard Home (/(dashboard)/home)

const analytics = await api.analytics.daily({ orgId, from, to });
const recentPayNotes = await api.paynotes.list({ orgId });
const topCategories = await api.categories.list(orgId);

Transaction Detail (/transactions/[id])

const payNote = await api.paynotes.get(payNoteId);

Wallet Detail (/wallets/[address])

const wallets = await api.wallets.list({ address });
const sentPayNotes = await api.paynotes.list({ address });

Counterparties (/(dashboard)/counterparties)

const counterparties = await api.counterparties.list(orgId, { type });

Categories & Rules (/(dashboard)/categories)

const categories = await api.categories.list(orgId);
const rules = await api.rules.list(orgId);
await api.categories.create(orgId, data);
await api.rules.create(orgId, data);

Search (/search)

const results = await api.search.search({ q: query, docType });

Settings (/(dashboard)/settings)

const organization = await api.organizations.get(orgId);
const members = await api.organizations.listAccounts(orgId);
const bindings = await api.bindings.list({ orgId });
await api.organizations.update(orgId, data);

Developer (/developer)

const networks = await api.networks.list();
const bindings = await api.bindings.list({ chainId });

Configuration

Environment variable for API base URL:

NEXT_PUBLIC_API_BASE_URL=https://api.paynote.app

Default: /api (uses Next.js API routes if not set)

Next Steps

  1. Implement Next.js API Routes - Create corresponding /app/api route handlers
  2. Add React Query/SWR - Wrap API calls for caching, refetching, mutations
  3. Add Loading States - Integrate with UI components for better UX
  4. Add Optimistic Updates - Update UI before server confirmation
  5. Add Request Interceptors - For authentication tokens, etc.
  6. Add Response Mocks - For development/testing without backend

Files Created

  • src/api/index.ts - Main exports (42 lines)
  • src/api/README.md - Complete documentation (265 lines)
  • src/api/lib/http.ts - HTTP client (130 lines)
  • src/api/lib/errors.ts - Error classes (65 lines)
  • src/api/types/requests.ts - Request DTOs (35 lines)
  • src/api/routes/networks.ts - Networks API (12 lines)
  • src/api/routes/organizations.ts - Organizations API (55 lines)
  • src/api/routes/wallets.ts - Wallets API (25 lines)
  • src/api/routes/categories.ts - Categories API (26 lines)
  • src/api/routes/rules.ts - Rules API (24 lines)
  • src/api/routes/counterparties.ts - Counterparties API (24 lines)
  • src/api/routes/bindings.ts - Bindings API (24 lines)
  • src/api/routes/paynotes.ts - PayNotes API (34 lines)
  • src/api/routes/analytics.ts - Analytics API (27 lines)
  • src/api/routes/fx-snapshots.ts - FX Snapshots API (25 lines)
  • src/api/routes/search.ts - Search API (24 lines)
  • src/api/routes/attachments.ts - Attachments API (21 lines)

Total: 17 files, ~858 lines of code

Status

✅ All API endpoints from OpenAPI spec implemented ✅ Type-safe with full TypeScript support ✅ Error handling with custom error classes ✅ Query parameter support ✅ Request/response DTOs ✅ Comprehensive documentation ✅ Ready for integration with UI pages ✅ Zero compilation errors