PayPack · by Xiamen Shizhun Technology

Supported payment channels

PayPack routes one payment call onto three different rails: Alipay (CNY), WeChat Pay (CNY), and x402 / AP2 on-chain payments (USDC or ETH). This page documents each rail, what it is good for, and its current verification status.

At a glance

Rail	Currency	Settlement	Best for	Verification
Alipay	CNY	Fiat, T+1 style merchant settlement	Users who pay with the Alipay app	Sandbox OK · Production verified
WeChat Pay	CNY	Fiat, merchant settlement	Users inside WeChat and mini programs	Backend OK · Production verified
x402 / AP2	USDC, ETH	On-chain	Machine-to-machine API payments	Testnet and mainnet verified

Alipay (CNY)

The agent creates a payment intent; PayPack calls the Alipay gateway with your app id and RSA2-signed request, and returns either a cashier URL (PC web) or the parameters a mobile frontend needs. The user completes the payment in the Alipay app.

Property	Value
Signer class	`paypack.signer.alipay.AlipaySigner`
Sandbox switch	`sandbox=True` (set `False` for production)
Web checkout	`signer.page_pay(out_trade_no, total_amount, subject, body)`
Direct send	`pay.send(to, amount, currency="CNY", subject)`
Credentials needed	app id, app private key, Alipay public key

WeChat Pay (CNY)

WeChat Pay uses a separate commercial module, paypack_wechat, which requires a license key. The open-source package ships a template (paypack_wechat_run.example.py) so you can see the exact shape of the integration.

Property	Value
Signer class	`paypack_wechat.WechatSigner`
Credentials needed	merchant id, certificate serial, API v3 key, private key, app id, notify URL
Frontend hand-off	`result["prepay_params"]` → `wx.requestPayment()`
Callback	Server-side notify endpoint; PayPack verifies and reconciles

Note: paypack_wechat is a commercial module. The license key is required by design, not by accident — it gates production WeChat Pay support.

x402 / AP2 on-chain (USDC / ETH)

For machine-to-machine payments, the merchant API answers HTTP 402 with a payment requirement. The agent parses it, pays, and retries the request with proof of payment — no human in the loop.

from paypack import AgentPay
import requests

pay = AgentPay(wallet_config={"private_key": "0x..."}, network="base-sepolia", spend_limit_daily=10.0)

response = requests.get("https://api.example.com/premium")
if response.status_code == 402:
    content = pay.auto_handle_402(response)

Supported networks

Network	Chain ID	Currencies
Base Sepolia (testnet)	84532	ETH, USDC
Base Mainnet	8453	ETH, USDC
Ethereum Mainnet	1	ETH, USDC
Polygon Mainnet	137	POL, USDC
Arbitrum Mainnet	42161	ETH, USDC

How to choose

Your users are in China and pay by phone → Alipay or WeChat Pay (CNY).
Your customer is another AI agent or an API → x402 (USDC / ETH).
You want both → keep the rail explicit in the call; PayPack does not guess the rail for you in production.

Summary

Three rails: Alipay CNY, WeChat Pay CNY, x402/AP2 on-chain (USDC/ETH).
Alipay and WeChat are production-verified; WeChat uses a licensed commercial module.
On-chain payments are verified on Base, Ethereum, Polygon and Arbitrum.
Choose by payer type: humans in China → fiat rails; machines and APIs → x402.

PayPack is a developer tool for payment integration. It does not provide investment services, does not promise returns, and does not hold user funds.
Operated by Xiamen Shizhun Technology Co., Ltd. (Unified Social Credit Code: 91350211MA34XHGG5T) · Website: rhcjw.com · ICP filing: 闽ICP备2024041817号-2