import FungibleToken from 0xf233dcee88fe0abe import NonFungibleToken from 0x1d7e57aa55817448 import Art, Auction, Versus from 0xd796ff17107bbff6 /* Transaction to make a bid in a marketplace for the given dropId and auctionId */ transaction(marketplace: Address, dropId: UInt64, auctionId: UInt64, bidAmount: UFix64) { // reference to the buyer's NFT collection where they // will store the bought NFT let vaultCap: Capability<&{FungibleToken.Receiver}> let collectionCap: Capability<&{Art.CollectionPublic}> let versusCap: Capability<&{Versus.PublicDrop}> let temporaryVault: @FungibleToken.Vault prepare(account: AuthAccount) { // get the references to the buyer's Vault and NFT Collection receiver var collectionCap = account.getCapability<&{Art.CollectionPublic}>(Art.CollectionPublicPath) // if collection is not created yet we make it. if !collectionCap.check() { // store an empty NFT Collection in account storage account.save<@NonFungibleToken.Collection>(<- Art.createEmptyCollection(), to: Art.CollectionStoragePath) // publish a capability to the Collection in storage account.link<&{Art.CollectionPublic}>(Art.CollectionPublicPath, target: Art.CollectionStoragePath) } self.collectionCap=collectionCap self.vaultCap = account.getCapability<&{FungibleToken.Receiver}>(/public/flowTokenReceiver) let vaultRef = account.borrow<&FungibleToken.Vault>(from: /storage/flowTokenVault) ?? panic("Could not borrow owner's Vault reference") let seller = getAccount(marketplace) self.versusCap = seller.getCapability<&{Versus.PublicDrop}>(Versus.CollectionPublicPath) let currentBid=self.versusCap.borrow()!.currentBidForUser(dropId: dropId, auctionId: auctionId, address: account.address) //if your capability is the leader you only have to send in the difference // withdraw tokens from the buyer's Vault self.temporaryVault <- vaultRef.withdraw(amount: bidAmount - currentBid) } execute { self.versusCap.borrow()!.placeBid(dropId: dropId, auctionId: auctionId, bidTokens: <- self.temporaryVault, vaultCap: self.vaultCap, collectionCap: self.collectionCap) } }

Transaction

Whoops! 😨 Something unexpected happened...