TokenApproval

ERC-20 steps

To create a stream, the caller must approve the creator contract to pull the tokens from the calling address's account. Then, we have to approve the Lockup contract to pull the tokens that the creator contract will be in possession of after they are transferred from the calling address (you):

// Transfer the provided amount of DAI tokens to this contract
DAI.transferFrom(msg.sender, address(this), totalAmount);

// Approve the Sablier contract to spend DAI
DAI.approve(address(LOCKUP), totalAmount);

For more guidance on how to approve and transfer ERC-20 tokens, see this article on the Ethereum website.