salsa crm donation

Does anyone have any experience in interfacing Drupal to the Salsa CRM? One of the things I need to do is to take donations through a form in Drupal (some of the form data must be immediately saved in Drupal so I can't Iframe the Salsa donation form). Any idea how this is done? Perhaps Salsa has a web service or other http protocol available?

Thanks,

captaindav