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Try to send Postback to url = http://www.diamondstrades.com/index.php?fc=module&module=ps_checkpayment&controller=checkout
                                <Message version="0.5">
	<Header>
		<Identity>
			<UserID>895</UserID>
			<Checksum>FB0EB2F748EC2DC2C0D98D0CEE56DB33621F638925102D03500016F58C972AB25C1C25309E8E5AB100AA9CA38E63E647AC1745E822B5320513E9D3E984306C40</Checksum>
		</Identity>
		<Time>20171018T074308+00</Time>
	</Header>
	<Body type="TransactionReportResponse">
		    <ReportedTransaction type="Purchase">
			<MerchantID>438</MerchantID>
			<OrderID>207</OrderID>
			<MerchantReference></MerchantReference>
			<PaymentMethod>CreditCard</PaymentMethod>
			<AmountMerchantCurrency>1771</AmountMerchantCurrency>
			<TotalOrderAmountMerchantCurrency>1771</TotalOrderAmountMerchantCurrency>
			<MerchantCurrency>USD</MerchantCurrency>
			<Label>Order : 207</Label>
			<AmountBuyerCurrency>1771</AmountBuyerCurrency>
			<TotalOrderAmountBuyerCurrency>1771</TotalOrderAmountBuyerCurrency>
			<BuyerCurrency>USD</BuyerCurrency>
			<Status>captured</Status>
			<ReferenceID>3698435</ReferenceID>
            <LastUpdate>20171018T074307+00</LastUpdate>
			<CreationDate>20171018T074254+00</CreationDate>
			<CaptureDate>20171018T074307+00</CaptureDate>
			<SettlementDate>20171026T120000+00</SettlementDate>
			<SettlementAmount>1691.31</SettlementAmount>
			<TotalOrderSettlementAmount>1691.31</TotalOrderSettlementAmount>
			<GrossSettlementAmount>1771</GrossSettlementAmount>
			<TotalOrderGrossSettlementAmount>1771</TotalOrderGrossSettlementAmount>
			<SettlementCurrency>USD</SettlementCurrency>
			<SiteAddress>http://www.diamondstrades.com/</SiteAddress>
			<Param1></Param1>
			<Param2></Param2>
			<Param3></Param3>
			<Live>false</Live>

            <Card>
            <CardMask></CardMask>
            </Card>

		</ReportedTransaction>

	</Body>
</Message>


PostbackFail
{
	"message": "Not valid response from merchant url = http://www.diamondstrades.com/index.php?fc=module&module=ps_checkpayment&controller=checkout",
	"curl_response": "OK",
	"curl_status": {
		"url": "http://www.diamondstrades.com/index.php?fc=module&module=ps_checkpayment&controller=checkout",
		"content_type": "text/plain; charset=windows-1252",
		"http_code": 200,
		"header_size": 1143,
		"request_size": 249,
		"filetime": -1,
		"ssl_verify_result": 0,
		"redirect_count": 0,
		"total_time": 0.529482,
		"namelookup_time": 0.060594,
		"connect_time": 0.090356,
		"pretransfer_time": 0.090392,
		"size_upload": 2446,
		"size_download": 5,
		"speed_download": 9,
		"speed_upload": 4619,
		"download_content_length": -1,
		"upload_content_length": 2446,
		"starttransfer_time": 0.120166,
		"redirect_time": 0,
		"redirect_url": "",
		"primary_ip": "136.243.150.143",
		"certinfo": [],
	},
	"curl_error": "0 "
}