create/integrate payment gateway plugin

hi .
i have integrate with my payment gateway account and successful..
so problem here is after payment complete the user account product still not active and manually approve by admin..
how can i integrate IPN?
anyone can help?please..

//my sample IPN post
class Am_Paysystem_Transaction_Yourps_Ipn extends Am_Paysystem_Transaction_Incoming
{
public function validateSource()
{
// there must be some code to validate if IPN came from payment system, and not from a "hacker"
return true;
}
public function validateStatus()
{
// there must be code to check post variables and confirm that the post indicates successful payment transaction
return true;
}
public function findInvoiceId()
{
// it takes invoiceId from request as sent by payment system
return $this->request->getFiltered('invoiceId); } public function getUniqId() { // take unique transaction id from yourps IPN post return $this->request->get('psReceipt'); } public function validateTerms() { // compare our invoice payment settings, and what payment system handled // if there is difference, it is possible that redirect url was modified // before payment return ($this->request->get('vp') == $this->invoice->first_total) && ($this->request->get('sp') == $this->invoice->second_total); } }

seems no one answer ..after try and try again..
finally i have done!

Hello,
It's possible to you post how you solve this because im having the same problem.
Thanks,
Antonio

hi..
when i reffer http://www.amember.com/docs/API/Paysystem seem something wrong at cooding
return $this->request->getFiltered('invoiceId);
(you should change to)return $this->request->getFiltered('invoiceId');