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Update documentation
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Vincent committed Jun 19, 2017
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##### 1. Include a transaction identifier

When setting up the SumUpPayment object, it is possible to pass an optional foreignTransactionID parameter. This identifier will be associated with the transaction and can be used to retrieve this transaction later. See <a href="https://sumup.com/docs/rest-api/transactions-api" target="_blank">API documentation</a> for details. Please make sure that this ID is unique within the scope of the SumUp merchant account and sub-accounts. It must not be longer than 128 characters.
The foreignTransactionID is available when the callback activity is called: `SumUpAPI.Param.FOREIGN_TRANSACTION_ID`

##### 2. Response flags

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