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U.S. Bank Europe DAC. Registered in Ireland – Number 418442..  Registered Office: Block F1, Cherrywood Business Park, Dublin 18, D18 W2X7, Ireland.
U.S. Bank Europe DAC, trading as Elavon Merchant Services, is regulated by the Central Bank of Ireland.
 
U.S. Bank Europe DAC. Registered in Ireland with Companies Registration Office. The liability of the member is limited. United Kingdom branch registered in England and Wales under the number BR022122.
U.S. Bank Europe DAC, trading as Elavon Merchant Services, is a credit institution authorised and regulated by the Central Bank of Ireland.  Authorised by the Prudential Regulation Authority.  Subject to regulation by the Financial Conduct Authority and limited regulation by the Prudential Regulation Authority.  Details about the extent of our regulation by the Prudential Regulation Authority are available from us on request.

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This transaction obtains real-time authorization for an EMV, magnetic stripe or contactless transaction but does not place the authorization in the Settlement batch.

This transaction type guarantees that funds are available on the card and reduces the cardholder's limit to buy for a pre-determined period (usually 7 - 10 days depending on the issuing bank).

To place the Auth only transaction in the Open batch, use Pre-auth complete to convert the transaction into a Sale or use Auth only reversal to delete and restore the funds in the card.

These are the processing options that you can integrate with a **Pre-auth** card transaction.

- :magic-link[Address verification service]{id="avs"}
- :magic-link[Manual card entry]{id="manual-entry"}
- :magic-link[Merchant transaction reference]{id="merchant-reference"}
- :magic-link[Partial approval]{id="partial-approval"}
- :magic-link[Token request]{id="request-token"}
- :magic-link[Pay with token]{id="token-sale"}

## Code samples

### CWS 

#### Request

| Property | Description |
| --- | --- |
| method string required | `startPaymentTransaction` |
| requestId string required | Transaction request ID |
| targetType string required | `paymentGatewayConverge` |
| parameters JSONObject required | All relevant parameters for Pre-auth transactions. |
| paymentGatewayId string required | Payment gateway ID Unique identifier of the payment gateway as returned in the openPaymentGateway transaction response. |
| transactionType string required | Transaction type Valid value: PRE_AUTH |
| baseTransactionAmount JSONObject required | Transaction amount to pre-authorize "baseTransactionAmount" : { "currencyCodeStr" : "USD", "amountInMinorUnits" : 1900 }, |
| tenderType string required | Tender type Valid value: CARD or CASH |
| discountAmounts array optional | Discount amount Deducted from `baseTransactionAmount`. key: "currencyCode" ("USD") key: "value" ("2000" - in minor units) |


#### Example

##### Request

```json
 {
 "method" : "startPaymentTransaction",
 "requestId" : "721787309",
 "targetType" : "paymentGatewayConverge",
 "version" : "1.0",
 "parameters" : {
 "paymentGatewayId" : "cc9b37e3-1a59-4c8b-a3e6-8e9b18468ab8",
 "transactionType" : "PRE_AUTH",
 "baseTransactionAmount" : {
 "value" : 3900,
 "currencyCode" : "USD"
 },
 "tenderType" : "CARD",
 "cardType" : null,
 "isTaxInclusive" : false,
 "taxAmounts" : [{
 "value" : 0,
 "currencyCode" : "USD"
 }],
 "discountAmounts" : null,
 }
}
```

##### Response

```json
{
 "requestId" : "721787331",
 "statusDetails" : "REQUEST_ACCEPTED",
 "data" : {
 "paymentGatewayCommand" : {
 "completed" : true,
 "eventQueue" : [ ],
 "chanId" : "0ea7e529-dc2f-43a7-9ace-a6293401c4b1",
 "paymentTransactionData" : {
 "result" : "APPROVED",
 "authCode" : "******",
 "date" : "Mon Mar 07 13:08:42 MST 2016",
 "cardEntryType" : "SWIPE",
 "resultMessage" : "APPROVED",
 "cardScheme" : "VISA",
 "amount" : {
 "currencyCode" : "USD",
 "value" : 3900
 },
 "id" : "070316A15-D808755A-4283-4280-B4D6-5029D84F34B3",
 "transactionType" : "PRE_AUTH",
 "approved" : "yes",
 "errors" : [ ],
 "maskedPan" : "******",
 "tenderType" : "CARD",
 "balanceDue" : {
 "currencyCode" : "UNKNOWN",
 "value" : 0
 }
 }
 }
 }
}
```

### Java 

1. Initialize Commerce SDK and receive an `ECLAccountInterface` instance named *account*.

2. Create a money object by specifying a currency code and an amount.

 ```java
 ECLMoney amount = new ECLMoney(ECLCurrencyCode.USD, 300L);
 ```

3. Create a transaction reference.

 ```java
 ECLPreAuthTransactionInterface transaction = account.getTransactionProcessor().createPreAuthTransactionWithSubtotal(amount);
 ```

4. Create a card tender instance.

 ```java
 ECLCardTenderInterface tender = account.getTransactionProcessor().createCardTender();
 ```

### Objective-C 

1. Initialize Commerce SDK and receive an `ECLAccountInterface` instance named *account*.

2. Create a money object by specifying a currency code and an amount.

 ```objc
 ECLMoney *amount = [[ECLMoney alloc] initWithMinorUnits:300 withCurrencyCode:ECLCurrencyCode_USD];
 ```

3. Create a transaction protocol.

 ```objc
 id<ECLCurrencyTransactionProtocol> saleTransaction = [[_account transactionProcessor] createPreAuthTransactionWithSubtotal:amount];
 ```

4. Create a card tender instance.

 ```objc
 id<ECLCardTenderProtocol> tender = [account.transactionProcessor createCardTender];
 ```

### C\# 

#### Request

```c#
PaymentArgs bea = new PaymentArgs();
Money m = new Money(Money.CurrencyCodefromString("USD"), myAmount);
bea.baseTransactionAmount = m;
bea.tenderType = TenderType.CARD; 
bea.transactionType = TransactionType.PRE_AUTH;

bea.paymentGatewayId = m_PaymentGatewayId; 

m_CWS.StartPaymentTransaction(bea, MyNotifyCWSEvent, MyPaymentComplete); 
```

Auth only

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Data as a Service

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