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txn_id (optional). Unique Transaction ID
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amount (required). Indicates total amount of purchase
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cur (optional). Currency Alphabetic Code (see ISO 4217)
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country_code (optional). Country Alphabetic Code (see ISO 3166)
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aff_id (optional). For all clicks our system also sends aff_id value, this value should be passed back when tracking affiliates.
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group_id (optional). This value is used to pass back product group identity to calculate commision according to product group settigns.
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add_info (optional). Additional information about transaction. It could be passed if you want, for example, display additional sale information to the transaction details such as code of purchased goods, or membership ID. This information will be visibile to both administrator and affiliate.
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customer_id (optional). Pass this parameter if you want to pay affiliate only for the first sale made by customer. Make sure you pass correct customer id - it can be alpha-numeric format.
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