---
name: zoho-api
description: |
  Zoho Books and Zoho Inventory API integration for TSH Clients Console. Use when:
  (1) Creating new API routes that call Zoho endpoints
  (2) Debugging API errors, token issues, or rate limits
  (3) Adding new Zoho data fetching functions
  (4) Understanding OAuth token caching with Upstash Redis
  (5) Working with products, orders, invoices, payments, or credit notes
  (6) Troubleshooting "Contact for price" or stock display issues
---

# Zoho API Integration

## Quick Reference

| API | Base URL |
|-----|----------|
| Zoho Inventory | `https://www.zohoapis.com/inventory/v1` |
| Zoho Books | `https://www.zohoapis.com/books/v3` |

**Organization ID**: `748369814`

## Code Files

| File | Purpose |
|------|---------|
| `src/lib/zoho/client.ts` | OAuth client, token caching, `zohoFetch` |
| `src/lib/zoho/products.ts` | Products, stock extraction |
| `src/lib/zoho/price-lists.ts` | Price list constants and fetching |
| `src/lib/zoho/customers.ts` | Customer lookup by email |
| `src/lib/zoho/orders.ts` | Sales orders |
| `src/lib/zoho/invoices.ts` | Invoices |
| `src/lib/zoho/payments.ts` | Payments |
| `src/lib/zoho/credit-notes.ts` | Credit notes |

## Using zohoFetch

```typescript
import { zohoFetch } from '@/lib/zoho/client';

// GET request
const data = await zohoFetch('/inventory/v1/items', {
  params: {
    organization_id: process.env.ZOHO_ORGANIZATION_ID,
    page: 1,
    per_page: 100,
  },
});

// Single item with locations
const item = await zohoFetch(`/inventory/v1/items/${itemId}`, {
  params: { organization_id: process.env.ZOHO_ORGANIZATION_ID },
});
```

## Token Caching (CRITICAL)

```
Memory Cache → Upstash Redis → Zoho OAuth Refresh
              (50-min TTL)    (rate limit: 10s guard)
```

If all prices show "Contact for price", check:
1. Upstash env vars in Vercel
2. `UPSTASH_REDIS_REST_URL` and `UPSTASH_REDIS_REST_TOKEN`
3. Run: `curl https://www.tsh.sale/api/debug/token`

## Common Endpoints

### Inventory API
```
GET /items                      # List products
GET /items/{id}                 # Single product (includes locations)
GET /categories                 # List categories
GET /pricebooks/{id}            # Pricebook with items
```

### Books API
```
GET /contacts                   # List customers
GET /salesorders                # Sales orders
GET /invoices                   # Invoices
GET /customerpayments           # Payments
GET /creditnotes                # Credit notes
```

## Caching with unstable_cache

```typescript
import { unstable_cache } from 'next/cache';

const getCachedProducts = unstable_cache(
  async () => await fetchProducts(),
  ['products'],
  { revalidate: 3600, tags: ['products'] }
);
```

Revalidate cache:
```bash
curl "https://www.tsh.sale/api/revalidate?tag=products&secret=tsh-revalidate-2024"
```

## Error Handling Pattern

```typescript
try {
  const data = await zohoFetch('/inventory/v1/items', { ... });
} catch (error) {
  if (error.message.includes('401')) {
    // Token expired - auto-refreshes
  } else if (error.message.includes('429')) {
    // Rate limited - wait and retry
  }
}
```

## Creating New API Route

```typescript
// src/app/api/zoho/[resource]/route.ts
import { NextResponse } from 'next/server';
import { zohoFetch } from '@/lib/zoho/client';

export async function GET(request: Request) {
  const data = await zohoFetch('/inventory/v1/items', {
    params: {
      organization_id: process.env.ZOHO_ORGANIZATION_ID,
    },
  });

  return NextResponse.json(data);
}
```

## Rate Limits

| API | Limit |
|-----|-------|
| OAuth Refresh | ~100/minute |
| Inventory API | 100/minute |
| Books API | 100/minute |

## Debug Commands

```bash
# Check token
curl "https://www.tsh.sale/api/debug/token"

# Check prices
curl "https://www.tsh.sale/api/debug/prices"

# Check stock
curl "https://www.tsh.sale/api/debug/stock"

# Revalidate cache
curl "https://www.tsh.sale/api/revalidate?tag=all&secret=tsh-revalidate-2024"
```