# 結帳與支付

## Payment types

```typescript
// asset
enum BuyStatus {
  SUCCESS = 'SUCCESS',
  WAIT_PAYMENT = 'WAIT_PAYMENT',
  FAILED = 'FAILED',
}
interface PayCallbackInput {
  successRedirectUrl: string;
  failureRedirectUrl: string;
  pendingRedirectUrl: string;
}
```

## buyAssetAndCreateCheckout

購買 NFT 並產生結帳連結 URL

```typescript
async function buyAssetAndCreateCheckout(
  assetBuyInput: AssetBuyInput,
  options?: AssetBuyOptions,
): Promise<AssetBuyResponse | null>;

interface AssetBuyInput {
  requestId: string;
  asset: AssetSaleInput;
  payCallback: PayCallbackInput;
  test?: boolean; // default false
  option?: AssetBuyOptionInput;
}

interface AssetSaleInput {
  assetVariantId: string;
  quantity: number;
  price: string;
  currency: CurrencyForAsset;
}

enum CurrencyForAsset {
  ETH = 'ETH',
  TWD = 'TWD',
  MATIC = 'MATIC',
}

interface AssetBuyOptionInput {
  beGift?: boolean;
  privateSaleCode?: string;
}

interface AssetBuyOptions {
  locale?: PaymentLocale;
}

interface AssetBuyResponse {
  assetBuy: AssetBuyInfo;
}

enum CheckoutPaymentType {
  UNSELECTED = 'UNSELECTED',
  FREE = 'FREE',
  CREDIT_CARD = 'CREDIT_CARD',
  TRANSFER = 'TRANSFER',
  CRYPTO = 'CRYPTO',
}

enum UnavailablePaymentReason {
  GAS_PRICE_SURGE
  PAYMENT_LIMIT_EXCEEDED
  EXCHANGE_PRICE_FAILED
  PAYMENT_MAINTENANCE
}

type UnavailablePayment {
  type: CheckoutPaymentType!
  reason: UnavailablePaymentReason!
}

interface AssetBuyInfo {
  status: BuyStatus;
  orderId: string;
  paymentUrl: string;
  paymentTypes: [CheckoutPaymentType!]!
  unavailablePayments: [UnavailablePayment!]!
}
```

**Example**

```typescript
const response = await qubicConnect.buyAssetAndCreateCheckout(assetBuyInput, { locale: 'zh' });

window.location.href = response.assetBuy.paymentUrl;
```


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