mohbadar/unipay

Uniswap-enabled Payments

Unipay

Uniswap-enabled payments. Allow payment to be made with any ERC-20 token while receiving payment in your token of choice using pooled liquidity.

Unipay accepts tokens and ether, converts these to the desired token, and makes approve calls to allow the payment recipient to transfer those tokens from the contract.

Authored by Vic Woeltjen for The Bee Token 🐝

Install

npm i

Compile

npm run compile

Compiled contracts will be written to the build directory as Truffle build artifacts.

Usage

A Unipay contract is deployed with the following configuration parameters:

• address factory: The address of the Uniswap factory contract to use to access swappable liquidity.
• address recipient: The address of the recipient for payments made via this contract.
• address token: The address of the token used to represent the payment, as received by the recipient.

Unipay exposes the following methods:

• price(address token, uint256 value): Get the cost, in units of the identified token, of making a payment of the specified value in this contract's configured payment token.
• price(uint256 value): Get the cost, in wei, of making a payment of the specified value in this contract's configured payment token.
• collect(address from, address token, uint256 value, uint256 deadline): Collect payment in the specified token from the from address and swap for value of the configured payment token, with a transaction deadline specified in seconds since the start of 1970. The from address must previously approve this contract to transfer a sufficient amount to complete the swap; user code should call price to determine an appropriate approval amount.
• pay(uint256 value, uint256 deadline) payable: Deliver payment as ether and swap for value of the configured payment token, with a transaction deadline specified in seconds since the start of 1970. Any excess ether sent with this call will be returned to the caller.