import FungibleToken from 0xf233dcee88fe0abe import NonFungibleToken from 0x1d7e57aa55817448 import FlowToken from 0x1654653399040a61 import FUSD from 0x3c5959b568896393 import FlowSwapPair from 0xc6c77b9f5c7a378f import FusdUsdtSwapPair from 0x87f3f233f34b0733 import StarlyCard from 0x5b82f21c0edf76e3 import StarlyCardMarket from 0x5b82f21c0edf76e3 transaction(itemID: UInt64, marketCollectionAddress: Address) { let paymentVault: @FungibleToken.Vault let starlyCardCollection: &StarlyCard.Collection{NonFungibleToken.Receiver} let marketCollection: &StarlyCardMarket.Collection{StarlyCardMarket.CollectionPublic} let buyerAddress: Address prepare(signer: AuthAccount) { self.buyerAddress = signer.address; self.starlyCardCollection = signer.borrow<&StarlyCard.Collection{NonFungibleToken.Receiver}>( from: StarlyCard.CollectionStoragePath ) ?? panic("Cannot borrow StarlyCard collection receiver from acct") self.marketCollection = getAccount(marketCollectionAddress) .getCapability<&StarlyCardMarket.Collection{StarlyCardMarket.CollectionPublic}>( StarlyCardMarket.CollectionPublicPath )! .borrow() ?? panic("Could not borrow market collection from market address") let saleItem = self.marketCollection.borrowSaleItem(itemID: itemID) ?? panic("No item with that ID") let fusdPrice = saleItem.price let amountUsdt = FusdUsdtSwapPair.quoteSwapToken2ForExactToken1(amount: fusdPrice) let amountFlow = FlowSwapPair.quoteSwapToken1ForExactToken2(amount: amountUsdt) / (1.0 - FlowSwapPair.feePercentage) + 0.00001 // swap Flow to FUSD let flowVault = signer.borrow<&FlowToken.Vault>(from: /storage/flowTokenVault) ?? panic("Could not borrow a reference to Vault") let token1Vault <- flowVault.withdraw(amount: amountFlow) as! @FlowToken.Vault let token2Vault <- FlowSwapPair.swapToken1ForToken2(from: <-token1Vault) let token3Vault <- FusdUsdtSwapPair.swapToken2ForToken1(from: <-token2Vault) if signer.borrow<&FUSD.Vault>(from: /storage/fusdVault) == nil { // Create a new FUSD Vault and put it in storage signer.save(<-FUSD.createEmptyVault(), to: /storage/fusdVault) // Create a public capability to the Vault that only exposes // the deposit function through the Receiver interface signer.link<&FUSD.Vault{FungibleToken.Receiver}>( /public/fusdReceiver, target: /storage/fusdVault ) // Create a public capability to the Vault that only exposes // the balance field through the Balance interface signer.link<&FUSD.Vault{FungibleToken.Balance}>( /public/fusdBalance, target: /storage/fusdVault ) } let fusdVault = signer.borrow<&FUSD.Vault>(from: /storage/fusdVault) ?? panic("Could not borrow a reference to Vault") fusdVault.deposit(from: <- token3Vault) self.paymentVault <- fusdVault.withdraw(amount: fusdPrice) } execute { self.marketCollection.purchase( itemID: itemID, buyerCollection: self.starlyCardCollection, buyerPayment: <- self.paymentVault, buyerAddress: self.buyerAddress ) } }

Transaction

Whoops! 😨 Something unexpected happened...