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A minimally viable implementation of PYUSD must:
  • Allow the recipient to create an Ethereum wallet address to receive PYUSD tokens.
  • Monitor the PYUSD main network address for transfers to the recipient’s wallet address.
  • Appropriately credit the user’s balance upon confirmed transfers.
  • Allow the user to transfer PYUSD tokens back to Paxos and PayPal using the contract’s transfer or transferFrom functions.
When using transferFrom, we recommend using the increaseApproval and decreaseApproval functions rather than approve. This avoids a well known attack vector in the standard approve function.