PHP coder needed to add payment method in PHPClassifieds

HI

I bought a script PHP Classifieds and there are a few built in payment methods like: paypal, 2checkout, world pay...

but i want to add a brazilian payment method that its called "PagSeguro" https://pagseguro.uol.com.br/CarrinhoProprio.aspx

php classifieds has his own cart, i will have 3 plans for users choose and pay.. in the site above they say that is just add an html code to my cart this will ad a payment button

this is the code:

<form target="pagseguro" action="https://pagseguro.uol.com.br/security/webpagamentos/webpagto.aspx" method="post">
<input type="hidden" name="email_cobranca" value="suporte@lojamodelo.com.br" />
<input type="hidden" name="tipo" value="CP" />
<input type="hidden" name="moeda" value="BRL" />
<input type="hidden" name="item_id_1" value="12345" />
<input type="hidden" name="item_descr_1" value="Descrição do item a ser vendido" />
<input type="hidden" name="item_quant_1" value="1" />
<input type="hidden" name="item_valor_1" value="100" />
<input type="hidden" name="item_frete_1" value="0" />
<input type="hidden" name="item_peso_1" value="0" />
<input type="image" src="https://pagseguro.uol.com.br/Security/Imagens/btnComprarBR.jpg" name="submit" alt="Pague com PagSeguro - é rápido, grátis e seguro!" />
</form>

Code (markup):

i need that the payment is make and my admin proccess the order as payd automatically

if u have knowledge and time to do the job send me a PM we with how many time do u need to do the job how much it gonna cost..

thankz