MAY 2026
1.) File validation for ‘Do File Upload’
Uploading files via the API is restricted to the same file types as when uploading via the enterprise GUI. If a file of an unsupported type is uploaded, the response will contain an error.
Category: News
API release news 04/26
ARPIL 2026
“Get search”: The search for addresses using telephone numbers has been improved
The search for addresses using telephone numbers has been improved. Different ways of writing telephone numbers (e.g. with spaces, hyphens or different country code variations) are now automatically recognised. Thanks to ElasticSearch running in the background, matching addresses are now found even faster.
API release news 03/26
MARCH 2026
1.) Breaking Change: Update to “Get Search criteria fields” endpoint.
We resolved an inconsistency regarding how possible options are returned for select fields. Previously, multiselect fields returned all options (both active and inactive), while single-select fields returned only active ones.
Update: Multiselect fields now behave the same as single-select fields and will only return active options. Inactive options are no longer included in the response payload.
2.) Link Email Attachments to Appointments
A new optional parameter, mailMessageId, has been added to the calendar creation action. This feature allows attachments from a specified email to be automatically linked and saved to the ‘Files’ tab of the newly created appointment in the onOffice App, mirroring the functionality available in onOffice enterprise.
API release news archive
On the subpages, you will find release news from 2024 and earlier.
API release news 12/25
DECEMBER 2025
1.) New API call “Agents log / Activities”
2.) Retrieve Immofeedback status (Status der Nachbereitung)
New request parameter “showFollowUpStatus” and new value “followUpStatus” in response parameter “contacts”.
3.) Set Immofeedback status (Status der Nachbereitung) via “Modify relations”
Request parameter “relationinfo” has been extended to include the value “statusTerminrueckmeldung”.