Your all configuration is ok. After payment redirect URL not correct. You need to fixed it in PayFirst Addons. If you want to check configuration, you can select another Payment Acquirers Wire Transfer and check it.

Here you get Idea about this.....
onecard_tx_values = dict(values)
onecard_tx_values.update({
'reff_id': values['reference'],
'amount': values['amount'],
'currency_code': values['currency'] and values['currency'].name or '',
'address1': values.get('partner_address'),
'city': values.get('partner_city'),
'country': values.get('partner_country') and values.get('partner_country').code or '',
'state': values.get('partner_state') and (values.get('partner_state').code or values.get('partner_state').name) or '',
'email': values.get('partner_email'),
'user_id': values.get('partner_id'),
'phone': values.get('partner_phone'),
'zip_code': values.get('partner_zip'),
'first_name': values.get('partner_first_name'),
'last_name': values.get('partner_last_name'),
'redirect': urls.url_join(self.onecard_domain_url, '/payment/onecard/dpn/'),
'success': urls.url_join(self.onecard_domain_url, '/payment/onecard/ipn/'),
})
return onecard_tx_values