my %content = {
  "RequestHeader" => {
    "SpecVersion" => "1.3",
    "CustomerId"=> "[your customer id]",
    "RequestId"=> "[unique request identifier]",
    "RetryIndicator"=> 0
  },
  "TerminalId"=> "[your terminal id]",
  "Payment"=> {
    "Amount"=> {
      "Value"=> "100",
      "CurrencyCode"=> "CHF"
    },
    "OrderId"=> "Id of the order",
    "Description"=> "Description of payment"
  },
  "ReturnUrls"=> {
    "Success"=> "[your shop payment success url]",
    "Fail"=> "[your shop payment fail url]"
  }
}