Changes to Create event integration

added the non-success response with the status 409

added the non-success response with the status 404

removed the enum value BILLETWEB from the path request parameter provider

removed the enum value BILLING from the path request parameter usage

removed the enum value MAILING from the path request parameter usage

removed the enum value MAILJET from the path request parameter provider

removed the enum value QONTO from the path request parameter provider

removed the enum value TICKETING from the path request parameter usage

added the new enum value agenda to the path request parameter usage

added the new enum value billetweb to the path request parameter provider

added the new enum value billing to the path request parameter usage

added the new enum value mailjet to the path request parameter provider

added the new enum value notification to the path request parameter usage

added the new enum value openplanner to the path request parameter provider

added the new enum value qonto to the path request parameter provider

added the new enum value slack to the path request parameter provider

added the new enum value ticketing to the path request parameter usage

added the new enum value webhook to the path request parameter provider

added the new enum value webhook to the path request parameter usage

removed the media type text/plain for the response with the status 400

removed the media type text/plain for the response with the status 401

added the media type application/json for the response with the status 400

added the media type application/json for the response with the status 401