RSS Feed/News can someone explain to me how purchasables work

[ENXF NET]

can someone help me understand the purchasable system I couldn't find any docs online anywhere, here is my code

my purchase form

Code:

<xf:js src="xf/payment.js" min="1" />

<div class="block">

<div class="block-container">

<div class="block-body">

<xf:form action="{{link('purchase')}}" method="post">

<xf:formrow rowtype="" label="Thread Title">

{$thread.title}

</xf:formrow>

<xf:formrow...

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