conect a php platform with the paypal API

HI there, I install a php crowdfunding platform, but the conection with the paypal API is not implemented. It is needed to implement the following functions class OAuthDataStore { function lookup_consumer($consumer_key) { // implement me } function lookup_token($consumer, $token_type, $token) { // implement me } function lookup_nonce($consumer, $token, $nonce, $timestamp) { // implement me } function new_request_token($consumer, $callback = null) { // return a new token attached to this consumer } function new_access_token($token, $consumer, $verifier = null) { // return a new access token attached to this consumer // for the user associated with this token if the request token // is authorized // should also invalidate the request token } ...let me know who is willing to work in this project. Thanks, Figs