Why isn't the "parameterized-urls" feature working?

Why isn't the "parameterized-urls" feature
working?


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BTW: We're using the XML API


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	$XML .= "<checkout-flow-support>";
	$XML .= "<merchant-checkout-flow-support>";
	$XML .= "<parameterized-urls>";
	$XML .= "<parameterized-url
url='".htmlspecialchars('h
ttps://www.freeheadset.org/xxxxx-removed-xxxxx.php').&qu
ot;'>";
	$XML .= "<parameters>";
	$XML .= "<url-parameter name='orderID'
type='order-id'/>";
	$XML .= "<url-parameter name='totalCost'
type='order-total'/>";
	$XML .= "<url-parameter name='taxes'
type='tax-amount'/>";
	$XML .= "</parameters>";
	$XML .= "</parameterized-url>";
	$XML .= "</parameterized-urls>";

	...

	$XML .=
"</merchant-checkout-flow-support>";
	$XML .= "</checkout-flow-support>";
	$XML .= "</checkout-shopping-cart>";


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I should mention that everything else works flawlessly.. 
but no matter
what I try, the "parameterized-urls" feature never
works..

am i missing something here?


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