Payment: sample.php or doc anyone??

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I try to port a tep payment module for a german payment service http://www.directpos.de/ to the milestone.

The old version had a sample.php payment module which served as something of a documentation stand-in. The Milestone has nothing. How does the payment module work?

Any hints, pointers, documentations, how-to's would be weldome!

My payment service needs me to call a url and gives back a page containing form-data. I used to use curl in my module for tep, in the before_process() funtion, and if the payment transation failed, I deleted the order directly in before_process, using

--- code snippet from modules/payment/directpos_ls.php, in before_process() --------

      if ($posResult['posherr'] != '0') {
	tep_db_query("delete from " . TABLE_ORDERS . " where orderS_id=" . $insert_id . ";");
	 tep_redirect(tep_href_link(FILENAME_CHECKOUT_PAYMENT,
				    'error_message=' . urlencode(MODULE_PAYMENT_DIRECTPOS_LS_TEXT_ERROR . " Error code: " . $posResult['posherr'] . " / " . $posResult['rc'] . ": " . $my_url . "?" . $my_postfields),
				    'SSL', true, false));
      }

------- end of code snippet -------------------

This was not elegantly solved, but did work (actually still does, see http://cbt.virtual-earth.de/ (german only))

Now, after some fiddling, I get it to register. That was easy :) But now  (at least) the "delete from order where orderS=id=$insert_id;" part fails, it seems $insert_id is no longer available.

_Any_ ideas, hints, tipps? (Thanks _a_lot_ if you have!! :-)


BTW _very_ nice work! thanks to developers.... Only documentation is sorely missed!


Cheers, Mathias