i18n & Currency

Pay4SaaS supports bilingual (Chinese/English) content and automatic currency switching, targeting both domestic (China) and international markets.

Site Detection

The system determines whether the current site is domestic or international based on NEXT_PUBLIC_SITE_URL:

NEXT_PUBLIC_SITE_URL=https://example.com      # International site
NEXT_PUBLIC_SITE_URL=https://example.cn        # Domestic site (.cn suffix)

URLs ending with .cn are recognized as domestic sites. You can also configure other top-level domains to be recognized as domestic in config/site.ts.

What Switches Automatically

Dimension	International Site	Domestic Site
Currency	USD ($)	CNY (¥)
Prices	`amount` / `priceMonthly`	`amountCNY` / `priceMonthlyCNY`
Payment	Manually configured via `NEXT_PUBLIC_PAYMENT_PROVIDERS`	Manually configured via `NEXT_PUBLIC_PAYMENT_PROVIDERS`
Language	English	Chinese

Price Switching

In config/payment.ts, each plan can have both USD and CNY prices configured:

basic: {
  amount: 9.99,       // USD (used on international site)
  amountCNY: 29,      // CNY (used on domestic site)
  // ...
}

If amountCNY is not configured, the domestic site will use the USD price (no automatic currency conversion).

Payment Provider Override

Payment providers must be configured manually via environment variables — there are no defaults:

NEXT_PUBLIC_PAYMENT_PROVIDERS=paypal,creem,stripe

Separate multiple providers with commas. The pricing page will display the providers you've enabled.

Documentation i18n

Documentation uses Fumadocs' file naming convention for Chinese/English separation:

content/docs/
├── index.mdx          # English version
├── index.cn.mdx       # Chinese version
├── pricing-models.mdx
├── pricing-models.cn.mdx
└── ...

English docs: /docs/xxx
Chinese docs: /cn/docs/xxx