Propstack CRM Integration
Automatic lead transfer to Propstack - contact data, property details, and GDPR status.
Last updated: 2026-08-19
The Propstack integration automatically transfers new leads to your Propstack CRM. All relevant contact and property data is synchronized.
Transferred Data
Contact Data
| Field | Description |
|---|---|
| Salutation | Mr/Ms |
| First Name | Contact's first name |
| Last Name | Contact's last name |
| Phone Number | Primary phone number |
| Alternative Number | Alternative phone number |
| Language | Preferred language |
Address
| Field | Description |
|---|---|
| Street | Street name |
| House Number | House number |
| Postal Code | ZIP code |
| City | City/Town |
GDPR
| Field | Description |
|---|---|
| Contact Permission | Consent for contact |
| GDPR Status | Data privacy consent |
Property Details (Custom Fields)
Property data is transferred as Custom Fields in Propstack:
| Custom Field | Description |
|---|---|
| id | Unique lead ID |
| segment | Property type (house, apartment, etc.) |
| wohnflaeche | Living area in m² |
| grundstuecksflaeche | Plot size in m² |
| zimmer | Number of rooms |
| baujahr | Year built |
| immobilienstandard | Equipment quality |
| immobilienzustand | Current condition |
| preiseinwertung | Estimated sale price |
| mietspanne | Estimated rental range |
| immobilienbewertung | Link to valuation |
| url | Link to lead detail page |
Displaying Custom Fields in Propstack
To see the property data in Propstack, you need to create the corresponding Custom Fields in Propstack.
How to create the Custom Fields:
- Open Propstack Admin → Custom Fields
- Select Kontakte (Contacts) as category
- Create a new group (e.g., "fluss.ai Property Data")
- Add the fields - important: The field name must match exactly with the names listed above (e.g.,
wohnflaeche,baujahr) - Extend your contact mask with the new group
Detailed instructions with video available in the Propstack Documentation: Custom Fields (German).
Activation
How to activate the integration:
- Create an automation of type CRM Integration
- Choose Propstack as the provider
- Paste your API Key (V1) and click Test connection
- Review the field mapping — the defaults match the table above
- Save it and attach the automation to your flow
Setup runs entirely inside fluss.ai — it no longer needs to be enabled by our team.
After activation, all new leads will be automatically transferred to Propstack. Existing leads will not be synchronized retroactively.
Creating the property as an object
Optionally, the integration also creates the valued property as an object in Propstack and links the lead to it as owner — so the valuation lands in your acquisition pipeline, not just in your contacts.
Object type, category and marketing type are derived from the lead's segment (e.g. single-family house → HOUSE / SINGLE_FAMILY_HOUSE / BUY). The estimate goes into the purchase price, or into the base rent for rental segments.
The option is off by default — your object list is yours, not ours.
Duplicates
If Propstack already knows the email address, the existing contact is reused instead of a second one being created. That contact is never overwritten: whatever you typed into it by hand stays.
This needs read permission for contacts on top of create. Without it the transfer still works — only duplicate detection is unavailable. The connection test tells you what your key can do.
Requirements
- Active Propstack account
- fluss.ai Pro or higher (CRM integrations are available from the Pro plan)
- Propstack API Key V1
Setting up the API Key
For the integration, you need the API Key V1 from Propstack:
- Open Propstack API Key Management
- Navigate to Verwaltung → API-Schlüssel
- Create a new API key or use an existing one
- Ensure the permission Kontakte → Erstellen (Contacts → Create) is enabled
The API key requires at least the "Kontakte > Erstellen" (Contacts > Create) permission to automatically create leads.
For questions about setup, contact our support team at support@fluss.ai.