Mission #4

As you slowly begin to get better at this blockchain stuff, your colleagues begin to notice the new skills you have gained - awesome! So it doesn't take long until one of them hits you up again on Slack, this time with an important mission: Let users use FUSD for their Dappy payments.

Hana Dappy

Senior developer

Heya, we want to integrate FUSD for payments! 📦

FUSD is a stablecoin on Flow. It's a fungible token backed by US dollar.

We need to write some logic to let users use FUSD for CryptoDappy. Can you please look into that?

You're awesome 💪 thanks!!

The mission brief

This mission focuses on fungible tokens and Flow's stablecoin FUSD.

The starting branch for this mission is mission-4

Interlude: smart contract overview

Before we start with the topic of this lesson, it might be helpful to get to know more about the smart contract powering CryptoDappy. Take a look at this high-level walkthrough which will help to build your mental model of the application's overall architecture.

Fungible token: high-level overview

FUSD is an implementation of the fungible token standard on Flow, so understanding FUSD necessitates a firm grasp on the concept of fungible tokens.

FUSD: checking vault & balance

After the high-level concepts out of the way, we'll now be jumping into the code to implement FUSD, checking for the vault of a user and the specific FUSD balance.

How to get FUSD on testnet

Getting Flow and FUSD

• Flow from Testnet Faucet
• FUSD from Bloctoswap Testnet