Retell AI - Zenbooker API Bridge
Budget: $30 – $250 USD
What we’re building:
A backend “bridge” that lets Retell AI automatically book, reschedule, and cancel appointments in Zenbooker.
Must-have outcomes:
When a caller tells Retell AI to book, reschedule, or cancel, the integration must:
1. Create / update / cancel the correct appointment in Zenbooker
2. Trigger Zenbooker’s built-in confirmation email automatically
3. Handle reschedules + cancellations cleanly (no broken states, no double-booking)
Business rules (optional, recommend what makes sense):
- Technician assignment
- Blackout windows (days/hours we don’t book)
- Lead-time rules (example: no same-day bookings after 3pm)
- Service-area limits (by zip code or radius)
Please flag which rules you recommend and why.
Tech preferences
- Use any stack you prefer: Node.js, Python, or similar
- Must be cloud-friendly, secure, and well-documented
- Retell AI does not have an API vault, so Cloudflare Workers is a popular option for securely handling API keys and running middleware
Deliverables
You will provide:
- A runnable middleware service (the bridge)
- Short setup docs covering: API keys, Webhooks. Environment variables, How to deploy/run
- A quick proof package: Test script or Postman collection. A Demonstration of all 3 flows: book, reschedule, cancel
- If you’ve built similar voice-bot-to-scheduler systems: A short note on your approach + architecture
Scope of Work (Core Tasks)
1) Review & mapping
- Review our current Retell AI call flow and triggers
- Map Retell outputs to Zenbooker inputs
2) Zenbooker API connection
- Connect Retell AI output to Zenbooker API endpoints
3) Booking logic
Build logic to:
- Validate address / service area
- Select correct service type + duration
- Fetch real-time availability
- Create new bookings in Zenbooker
4) Data passing (Retell → Zenbooker)
Send these fields:
- Name
- Phone
- Address
- Email
- Service type
- Notes
5) Error handling
Handle common failures gracefully:
- Out of service area
- No available time slots
- Invalid or missing customer info
- API failures (timeouts, retries, safe fallback messaging)
6) Webhooks (optional)
- Webhook handler for booking confirmation/status updates
7) Demo + docs
- Short documentation
- Working demonstration of all flows
Success Definition (Goal)
A seamless voice booking experience:
Customer speaks → Retell AI → Zenbooker creates/updates appointment → Confirmation email is sent
A backend “bridge” that lets Retell AI automatically book, reschedule, and cancel appointments in Zenbooker.
Must-have outcomes:
When a caller tells Retell AI to book, reschedule, or cancel, the integration must:
1. Create / update / cancel the correct appointment in Zenbooker
2. Trigger Zenbooker’s built-in confirmation email automatically
3. Handle reschedules + cancellations cleanly (no broken states, no double-booking)
Business rules (optional, recommend what makes sense):
- Technician assignment
- Blackout windows (days/hours we don’t book)
- Lead-time rules (example: no same-day bookings after 3pm)
- Service-area limits (by zip code or radius)
Please flag which rules you recommend and why.
Tech preferences
- Use any stack you prefer: Node.js, Python, or similar
- Must be cloud-friendly, secure, and well-documented
- Retell AI does not have an API vault, so Cloudflare Workers is a popular option for securely handling API keys and running middleware
Deliverables
You will provide:
- A runnable middleware service (the bridge)
- Short setup docs covering: API keys, Webhooks. Environment variables, How to deploy/run
- A quick proof package: Test script or Postman collection. A Demonstration of all 3 flows: book, reschedule, cancel
- If you’ve built similar voice-bot-to-scheduler systems: A short note on your approach + architecture
Scope of Work (Core Tasks)
1) Review & mapping
- Review our current Retell AI call flow and triggers
- Map Retell outputs to Zenbooker inputs
2) Zenbooker API connection
- Connect Retell AI output to Zenbooker API endpoints
3) Booking logic
Build logic to:
- Validate address / service area
- Select correct service type + duration
- Fetch real-time availability
- Create new bookings in Zenbooker
4) Data passing (Retell → Zenbooker)
Send these fields:
- Name
- Phone
- Address
- Service type
- Notes
5) Error handling
Handle common failures gracefully:
- Out of service area
- No available time slots
- Invalid or missing customer info
- API failures (timeouts, retries, safe fallback messaging)
6) Webhooks (optional)
- Webhook handler for booking confirmation/status updates
7) Demo + docs
- Short documentation
- Working demonstration of all flows
Success Definition (Goal)
A seamless voice booking experience:
Customer speaks → Retell AI → Zenbooker creates/updates appointment → Confirmation email is sent