> ## Documentation Index
> Fetch the complete documentation index at: https://sequence-0fb8d9e6-relayer_docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.
# Checkout
> Documentation for Unreal SDK overview for the Sequence infrastructure stack for web3 gaming.
## Creating Transactions
### Generate Listing Transaction
```cpp theme={null}
const TSuccessCallback OnApiSuccess = [this, OnSuccess](const FGenerateTransactionResponse& Response) { };
const FFailureCallback OnApiFailure = [this, OnFailure](const FSequenceError& Error) { };
USequenceCheckout* Checkout = NewObject();
Checkout->GenerateListingTransaction(SequenceSdk::GetChainId(), WalletAddress, CollectionAddress, TokenId, Amount, ContractType, CurrencyTokenAddress, PricePerToken, Expiry, OrderbookKind, WalletKind, OnApiSuccess, OnApiFailure);
```
### Generate Offer Transaction
```cpp theme={null}
const TSuccessCallback OnApiSuccess = [this, OnSuccess](const FGenerateTransactionResponse& Response) { };
const FFailureCallback OnApiFailure = [this, OnFailure](const FSequenceError& Error) { };
USequenceCheckout* Checkout = NewObject();
Checkout->GenerateOfferTransaction(SequenceSdk::GetChainId(), WalletAddress, CollectionAddress, TokenId, Amount, ContractType, CurrencyTokenAddress, PricePerToken, Expiry, OrderbookKind, WalletKind, OnApiSuccess, OnApiFailure);
```
### Generate Buy Transaction
```cpp theme={null}
const TSuccessCallback OnApiSuccess = [this, OnSuccess](const FGenerateTransactionResponse& Response) { };
const FFailureCallback OnApiFailure = [this, OnFailure](const FSequenceError& Error) { };
USequenceCheckout* Checkout = NewObject();
Checkout->GenerateBuyTransaction(SequenceSdk::GetChainId(), WalletAddress, Order, Amount, AdditionalFee, WalletKind, OnApiSuccess, OnApiFailure);
```
### Generate Sell Transaction
```cpp theme={null}
const TSuccessCallback OnApiSuccess = [this, OnSuccess](const FGenerateTransactionResponse& Response) { };
const FFailureCallback OnApiFailure = [this, OnFailure](const FSequenceError& Error) { };
USequenceCheckout* Checkout = NewObject();
Checkout->GenerateSellTransaction(SequenceSdk::GetChainId(), WalletAddress, Order, Amount, AdditionalFee, WalletKind, OnApiSuccess, OnApiFailure);
```
### Generate Cancel Transaction
```cpp theme={null}
const TSuccessCallback OnApiSuccess = [this, OnSuccess](const FGenerateTransactionResponse& Response) { };
const FFailureCallback OnApiFailure = [this, OnFailure](const FSequenceError& Error) { };
USequenceCheckout* Checkout = NewObject();
Checkout->GenerateCancelTransaction(SequenceSdk::GetChainId(), WalletAddress, CollectionAddress, OrderId, MarketplaceKind, OnApiSuccess, OnApiFailure);
```
### Generate Cancel Transaction by Order
```cpp theme={null}
const TSuccessCallback OnApiSuccess = [this, OnSuccess](const FGenerateTransactionResponse& Response) { };
const FFailureCallback OnApiFailure = [this, OnFailure](const FSequenceError& Error) { };
USequenceCheckout* Checkout = NewObject();
Checkout->GenerateCancelTransactionByOrder(SequenceSdk::GetChainId(), WalletAddress, CollectionAddress, Order, MarketplaceKind, OnApiSuccess, OnApiFailure);
```
### Steps to Transaction
```cpp theme={null}
UTransactions* Transactions = NewObject();
for (const FTransactionStep& Step : Steps)
{
FRawTransaction RawTransaction = FRawTransaction(Step.To, Step.Data, Step.Value.IsEmpty() ? TEXT("0") : Step.Value);
Transactions->AddRaw(RawTransaction);
}
```
## Checkout Options
### Get Checkout Options
```cpp theme={null}
const TSuccessCallback OnApiSuccess = [this, OnSuccess](const FGetCheckoutOptionsResponse& Response) { };
const FFailureCallback OnApiFailure = [this, OnFailure](const FSequenceError& Error) { };
USequenceCheckout* Checkout = NewObject();
Checkout->GetCheckoutOptions(SequenceSdk::GetChainId(), WalletAddress, Orders, AdditionalFeeBps, OnApiSuccess, OnApiFailure);
```
### Get Checkout Options by Orders
```cpp theme={null}
const TSuccessCallback OnApiSuccess = [this, OnSuccess](const FGetCheckoutOptionsResponse& Response) { };
const FFailureCallback OnApiFailure = [this, OnFailure](const FSequenceError& Error) { };
USequenceCheckout* Checkout = NewObject();
Checkout->GetCheckoutOptionsByOrders(SequenceSdk::GetChainId(), WalletAddress, Orders, AdditionalFeeBps, OnApiSuccess, OnApiFailure);
```
### Get Checkout Options by ERC1155 Sale
```cpp theme={null}
const TSuccessCallback OnApiSuccess = [this, OnSuccess](const FGetCheckoutOptionsResponse& Response) { };
const FFailureCallback OnApiFailure = [this, OnFailure](const FSequenceError& Error) { };
USequenceCheckout* Checkout = NewObject();
Checkout->GetCheckoutOptionsByERC1155Contract(SequenceSdk::GetChainId(), WalletAddress, SaleContract, CollectionAddress, TokenId, Amount, OnApiSuccess, OnApiFailure);
```
### Get Checkout Options by ERC721 Sale
```cpp theme={null}
const TSuccessCallback OnApiSuccess = [this, OnSuccess](const FGetCheckoutOptionsResponse& Response) { };
const FFailureCallback OnApiFailure = [this, OnFailure](const FSequenceError& Error) { };
USequenceCheckout* Checkout = NewObject();
Checkout->GetCheckoutOptionsByERC721Contract(SequenceSdk::GetChainId(), WalletAddress, SaleContract, CollectionAddress, TokenId, Amount, OnApiSuccess, OnApiFailure);
```
### Get Checkout Options by Token Id Amounts
```cpp theme={null}
const TSuccessCallback OnApiSuccess = [this, OnSuccess](const FGetCheckoutOptionsResponse& Response) { };
const FFailureCallback OnApiFailure = [this, OnFailure](const FSequenceError& Error) { };
USequenceCheckout* Checkout = NewObject();
Checkout->GetCheckoutOptionsByTokenIdAmounts(SequenceSdk::GetChainId(), WalletAddress, SaleContract, CollectionAddress, AmountsByTokenId, OnApiSuccess, OnApiFailure);
```