The `SablierWrapper` contract facilitates the management of ERC20 tokens in a buy-now-pay-later (BNPL) context. It initializes with a voucher source and stream ID, allowing only the BNPL address to withdraw tokens. Withdrawn tokens are transferred from the voucher address to the contract and then to the BNPL address. It also tracks the total repaid amount, which includes the collected amount and the contract's current balance. The contract includes a placeholder for handling ERC721 token receipts.

The `ExpressoBNPL` contract facilitates Buy Now, Pay Later (BNPL) loans using ERC721 NFTs as collateral and ERC20 tokens for repayment. It integrates with the Sablier protocol to create linear repayment streams. Borrowers can take loans by collateralizing NFTs, and repayments are managed through Sablier streams. The contract also includes functions for claiming repaid collateral and checking repayment status.

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