import NonFungibleToken from 0x1d7e57aa55817448 import DarkCountry from 0xc8c340cebd11f690 import DarkCountryMarket from 0xc8c340cebd11f690 import FungibleToken from 0xf233dcee88fe0abe import FlowToken from 0x1654653399040a61 transaction(saleItemID: UInt64, marketCollectionAddress: Address) { let paymentVault: @FungibleToken.Vault let darkCountryCollection: &DarkCountry.Collection{NonFungibleToken.Receiver} let marketCollection: &DarkCountryMarket.Collection{DarkCountryMarket.CollectionPublic} prepare(signer: AuthAccount) { // if the account doesn't already have a collection if signer.borrow<&DarkCountry.Collection>(from: DarkCountry.CollectionStoragePath) == nil { // create a new empty collection let collection <- DarkCountry.createEmptyCollection() // save it to the account signer.save(<-collection, to: DarkCountry.CollectionStoragePath) // create a public capability for the collection signer.link<&DarkCountry.Collection{NonFungibleToken.CollectionPublic, DarkCountry.DarkCountryCollectionPublic}>(DarkCountry.CollectionPublicPath, target: DarkCountry.CollectionStoragePath) } // if the account doesn't already have a collection if signer.borrow<&DarkCountryMarket.Collection>(from: DarkCountryMarket.CollectionStoragePath) == nil { // create a new empty collection let collection <- DarkCountryMarket.createEmptyCollection() as! @DarkCountryMarket.Collection // save it to the account signer.save(<-collection, to: DarkCountryMarket.CollectionStoragePath) // create a public capability for the collection signer.link<&DarkCountryMarket.Collection{DarkCountryMarket.CollectionPublic}>(DarkCountryMarket.CollectionPublicPath, target: DarkCountryMarket.CollectionStoragePath) } self.marketCollection = getAccount(marketCollectionAddress) .getCapability<&DarkCountryMarket.Collection{DarkCountryMarket.CollectionPublic}>( DarkCountryMarket.CollectionPublicPath )! .borrow() ?? panic("Could not borrow market collection from market address") let saleItem = self.marketCollection.borrowSaleItem(itemID: saleItemID) ?? panic("No item with that ID") let price = saleItem.price let mainFlowTokenVault = signer.borrow<&FlowToken.Vault>(from: /storage/flowTokenVault) ?? panic("Cannot borrow FlowToken vault from acct storage") self.paymentVault <- mainFlowTokenVault.withdraw(amount: price) self.darkCountryCollection = signer.borrow<&DarkCountry.Collection{NonFungibleToken.Receiver}>( from: DarkCountry.CollectionStoragePath ) ?? panic("Cannot borrow DarkCountry collection receiver from acct") } execute { self.marketCollection.purchase( itemID: saleItemID, buyerCollection: self.darkCountryCollection, buyerPayment: <- self.paymentVault ) } }

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Transaction