Submit webforms with CiviMRF to [https://lab.civicrm.org/extensions/form-procesor](CiviCRM Form Processor)
The CiviCRM Form Processor extension allows a CiviCRM site administrator to define end points for forms and do the processing in CiviCRM.
For example you could define a form processor to create or find a contact based on the given email address and then subscribe this contact to the newsletter group. You could then use this module in your external drupal website to process a webform by the form processor in CiviCRM.
Below the screenshot of the form processor in CiviCRM:
And a screenshot of setup of the drupal webform: