[solved] Configuring Generic send SMS URL

Hi all, i´m configuring a new sms provider and this is the SMS URL that i´m using:

https://provider.com/smsgw/sendsms.php?user=theuser&password=thepassword&sender=Me&recipients=34609nnnNNN&message=message&dlr=1 <- this works ok directly from browser input (sms provider register and deliver ok the msg)

https://provider.com/smsgw/sendsms.php?user=theuser&password=thepassword&sender=%{sender}&recipients=%{mobile}&message=%{message}&dlr=1 <- this doesn´t work, sms provider doesn´t accept the url chain.

Can anyone indicate me which values/variable do i have to put in sender, recipients and message fields?. Don´t know exactly which format uses.

SOLVED: https://provider.com/sms.php?user={GENERIC_API_USERNAME}&password={GENERIC_API_PASSWORD}&sender={GENERIC_SENDER}&recipients={GENERIC_TO}&message={GENERIC_MESSAGE}&dlr={1}

Note: it´s configured as Generric gateway.