Order Request
How the Bando Fulfillment Protocol receives new requests.
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How the Bando Fulfillment Protocol receives new requests.
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Right after a user has selected a product or service to buy, the wallet will send a request to the Bando Fulfillment Protocol to create a new order. Before submitting a request, the according ref MUST have been verified by the Bando backend system and ingested to the RefRegistry smart contract. Once that is in place, a user SHALL interact with the BandoRouter contract to submit a fulfillment request.
The Bando Router Contract is a smart contract responsible for routing the user's service request to the appropriate Bando Escrow contract using a managed Service Registry contract. The process follows these steps:
The BandoRouter first checks the RefRegistry to validate the payment reference
If the reference is valid, the router looks up the appropriate Escrow contract using the Service Registry
Once the router verifies the reference and identifies the correct Escrow, it transfers the funds to the escrow
The router contract then emits a ServiceRequested event with the necessary data
Once the funds for the request are in the corresponding Escrow contract, the fulfiller is notified and becomes responsible for processing the product or service request and fulfilling the user's request off-chain
Token Approval
The user (payer) must first approve the BandoRouter contract to spend their ERC20 tokens by calling approve() on the ERC20 token contract.
The user calls requestERC20Service() on the BandoRouterV1_1 contract, specifying:
Service ID
ERC20 token address
Token amount
Service reference
Other request parameters
Request Validation
The router validates the request using FulfillmentRequestLib.validateERC20Request() to ensure:
The service exists in the registry
The service reference is valid
The token is supported
Fee Calculation
The router calculates service fees using FulfillmentRequestLib.calculateFees().
Token Transfer
The router transfers tokens from the user to the escrow contract using safeTransferFrom().
Escrow Deposit
The router calls depositERC20() on the BandoERC20Fulfillable contract.
Record Creation:
The escrow contract creates a fulfillment record and stores deposit information.
