import DapperUtilityCoin from 0xead892083b3e2c6c import Seussibles from 0x321d8fcde05f6e8c import FungibleToken from 0xf233dcee88fe0abe import NFTStorefront from 0x4eb8a10cb9f87357 import NonFungibleToken from 0x1d7e57aa55817448 import TiblesNFT from 0x5cdeb067561defcb transaction(listingResourceID: UInt64, storefrontAddress: Address, expectedPrice: UFix64) { let paymentVault: @FungibleToken.Vault let buyerSeussiblesCollection: &{TiblesNFT.CollectionPublic} let storefront: &NFTStorefront.Storefront{NFTStorefront.StorefrontPublic} let listing: &NFTStorefront.Listing{NFTStorefront.ListingPublic} let balanceBeforeTransfer: UFix64 let mainDucVault: &DapperUtilityCoin.Vault prepare(dapper: AuthAccount, buyer: AuthAccount) { // Initialize the buyer's account if it is not already initialized if buyer.borrow<&Seussibles.Collection>(from: Seussibles.CollectionStoragePath) == nil { buyer.save(<-Seussibles.createEmptyCollection(), to: Seussibles.CollectionStoragePath) buyer.link<&Seussibles.Collection{TiblesNFT.CollectionPublic, NonFungibleToken.Receiver}>( Seussibles.PublicCollectionPath, target: Seussibles.CollectionStoragePath ) } // Fetch the storefront where the listing exists self.storefront = getAccount(storefrontAddress) .getCapability<&NFTStorefront.Storefront{NFTStorefront.StorefrontPublic}>( NFTStorefront.StorefrontPublicPath ) .borrow() ?? panic("Could not borrow Storefront from provided address") // Fetch the listing from the storefront by ID self.listing = self.storefront.borrowListing(listingResourceID: listingResourceID) ?? panic("No Offer with that ID in Storefront") // Get access to Dapper's DUC vault let salePrice = self.listing.getDetails().salePrice self.mainDucVault = dapper.borrow<&DapperUtilityCoin.Vault>(from: /storage/dapperUtilityCoinVault) ?? panic("Cannot borrow DapperUtilityCoin vault from dapper storage") // Withdraw the appropriate amount of DUC from the vault self.balanceBeforeTransfer = self.mainDucVault.balance self.paymentVault <- self.mainDucVault.withdraw(amount: salePrice) // Check that the price is what we expect if (expectedPrice != salePrice) { panic("Expected price does not match sale price") } self.buyerSeussiblesCollection = buyer .getCapability<&{TiblesNFT.CollectionPublic}>(Seussibles.PublicCollectionPath) .borrow() ?? panic("Could not borrow Seussibles Collection from provided address") } execute { let tible <- self.listing.purchase( payment: <-self.paymentVault ) as! @Seussibles.NFT self.buyerSeussiblesCollection.depositTible(tible: <- tible) } post { // Ensure there is no DUC leakage self.mainDucVault.balance == self.balanceBeforeTransfer: "transaction would leak DUC" } }

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Transaction