Product
AI Voice Agent for Invoice Collection
Syntharra’s AI voice agent calls your overdue customers, confirms the amount owed, and takes a card payment right on the call. It opens every call with the required legal disclosures, operates within legal calling windows, and hands off to you the moment something requires a human judgment. You pay 10% of whatever gets recovered. Nothing if nothing does.
What the agent says
The opening is always the same two lines, hardcoded in the call flow rather than generated by the AI model:
“This call may be recorded. I’m an AI assistant calling on behalf of [Your Business Name]. I’m reaching out about invoice [Invoice Number] for [$Amount], which was due on [Due Date].”
The values in purple brackets come from QuickBooks or your accounting system. The AI model never generates them. After the opening, the agent asks how the customer would like to resolve the balance. If they want to pay now, it walks them through card collection. If they want to call back, it confirms a time and logs it. If they dispute the amount, it flags the call for your review without arguing.
The AI does not threaten, does not misrepresent the amount owed, and does not claim to be a human if asked directly. It ends the call if the customer says anything that a reasonable listener would interpret as an opt-out.
Why it works
The agent has heard this call before
Syntharra’s voice agent is trained on hundreds of thousands of hours of real invoice collection calls — across trade industries, invoice sizes, dispute types, and customer responses. It already knows how customers sound when they forgot to pay, when they dispute the amount, when they need more time. That training is what produces the recovery rates. No configuration required from you.
100k+
hours of real collection call audio used in training
73%
average recovery rate on invoices under 90 days past due
Zero
hours of agent configuration required — it starts working the day you connect
How a call flows from first ring to settled payment
The agent handles the entire arc of a collection call without you being on the line. Here is what happens at each stage.
Step 1 — answer
Customer picks up. The agent delivers the two opening disclosures, identifies your business, names the invoice number and the balance, and asks if this is a good time to talk.
Step 2 — confirm
Agent confirms the customer recognises the invoice. If they dispute the amount, the call ends and the invoice is flagged for your review. If they confirm, the agent moves to payment.
Step 3 — pay
Customer gives their card number, expiration date, and CVV. The agent reads the total back and requests verbal authorisation before charging. Payment goes to your Stripe account. Receipt is emailed to the customer.
Step 4 — close
Invoice is marked paid in your dashboard. The 10% Syntharra fee is deducted at Stripe settlement; the remaining 90% settles to your bank account within 2 to 5 business days.
When no one answers
On the first unanswered attempt, the agent leaves a short voicemail where permitted by state law. The message gives your business name, a callback number, and a brief statement that there is an outstanding invoice. It does not state the amount in the voicemail — that is intentional, to avoid disclosing financial information to a third party who might access the voicemail.
The second attempt is on a different day, at a different time within the legal window. No voicemail is left on the second or third attempt. If the customer calls back the voicemail number, the AI agent answers and can pick up the conversation from where the voicemail left off.
After three attempts with no contact, the invoice moves to your escalation queue with a full log of all attempts, so you can decide whether to pursue it directly or write it off.
Compliance is in the infrastructure, not a setting
These are not configuration options. They are enforced at the system level before any call is dialled.
Calling window
9 am to 8 pm in the customer’s local timezone. Timezone is derived from the billing address on the invoice. No calls on Saturdays or Sundays.
Attempt limits
Maximum 3 calls per invoice. Minimum 3 days between attempts on the same invoice. The counter cannot be reset without your explicit action.
Instant opt-out
Any phrase that a reasonable listener interprets as “stop calling” triggers immediate removal from the global do-not-call list across every Syntharra client.
TCPA opening disclosures
“This call may be recorded” and “I’m an AI assistant” run before any substantive conversation. They come from the Retell voice flow, not the language model.
For the full compliance picture, see the compliance page.
Pricing: 10% of recovered invoices, nothing else
Syntharra earns 10% of the amount collected on a call. A $1,500 invoice recovered means $150 to Syntharra and $1,350 to you. No monthly fee. No setup fee. No per-call charge whether the call results in payment or not.
The fee is deducted at Stripe settlement, so you never receive an invoice from Syntharra. The gross amount hits your Stripe account and the net settles to your bank. If nothing is recovered, Syntharra earns nothing.
There is no contract. You can disconnect at any time from your dashboard and no future invoices will be called. There is no clawback on fees already earned from calls that resulted in payment.
Common questions
What does the AI say when it calls?
The call opens with two hardcoded disclosures that run before any conversation: "This call may be recorded" and "I'm an AI assistant calling on behalf of [Your Business]." These come from the Retell voice flow — not the AI model — so they cannot be skipped or altered by the conversational layer. After the disclosures, the agent states the invoice number and the amount owed, and asks how the customer would like to resolve it.
Can the agent take a credit card payment on the call?
Yes. Once the customer agrees to pay, the agent reads back the amount and collects the card number, expiration date, and CVV over the phone. Payment is processed through your Stripe account via Stripe Connect — funds settle directly to your bank account, not to Syntharra. The customer receives an email receipt immediately after the call ends.
What if the customer disputes the invoice amount?
The agent does not argue or negotiate. If a customer says the amount is wrong or they don’t recognise the invoice, the agent notes the dispute, confirms the customer’s preferred contact method, and flags the call for human review in your dashboard. The invoice is paused — no further automated calls until you’ve reviewed and either corrected the invoice or confirmed it.
What happens after 3 failed call attempts?
After three unanswered or refused calls — each separated by at least three days — the invoice moves to your human escalation queue. You’ll see the full call history: timestamp, duration, whether a voicemail was left, and a transcript of any conversation that did happen. From there it’s your call whether to pursue the matter directly or write it off.
Is calling with an AI voice agent legal?
Yes, with the right disclosures in place. Every call opens with the TCPA-required identification ("I'm an AI assistant") and call-recording notice. Calls are placed only between 9am and 8pm in the customer's local timezone, never on weekends, and maximum three times per invoice. The customer's billing address from your accounting system determines which timezone applies.
Can I listen to call recordings?
Yes. Every call is recorded and available in your Syntharra dashboard within a few minutes of the call ending. You’ll find the audio file, a full transcript, and the call outcome (paid, disputed, voicemail, no answer). Recordings are retained for four years to satisfy most state record-keeping requirements.
Related
- Smart Dialer — timezone detection, retry logic, and voicemail handling.
- Payment Recovery — the full recovery loop from overdue invoice to settled funds.
- Compliance — TCPA, state call windows, DNC, and call-recording consent.
- Get started — connect QuickBooks or your accounting system in under 2 minutes.
Connect your accounting system and the agent starts working
No monthly fees. No contracts. 10% of what gets recovered, nothing on invoices that don’t.
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