What changed at Synthflow on September 15, 2026, and what it means for agencies.
UpdateBy CenterfyUpdated
The short answer
Synthflow removed in-product reselling on September 15, 2026. According to its own documentation, three things went away: custom pricing plans, the Stripe integration that charged your clients, and the Plan & Billing and Usage pages inside each subaccount. Client subscriptions that were collected through Synthflow stopped working. This is a billing change, not a shutdown: your own Synthflow subscription, your minute pool, your subaccounts, branding, custom domain and agents are unchanged. What is different is that charging clients, tracking their overage and working out your margin are now your job, in your own Stripe account or billing system.
What Synthflow's documentation says
Synthflow published a reselling page in its documentation that explains the removal. We read it, together with the related Stripe, pricing, subaccount, limits and billing pages, on November 5, 2026. Everything in this table comes from those pages.
| Item | What the documentation says |
|---|---|
| Date | September 15, 2026 |
| What was removed | In-product reselling: creating pricing plans in Synthflow, connecting Stripe and billing subaccounts automatically. |
| Pricing plans | The Pricing Plans page under Settings, Partner is gone. Plans no longer drive billing, limits or automatic plan behaviour. |
| Stripe | Stripe accounts connected for reselling were disconnected, and a new connection is no longer possible. |
| Subaccount pages | Subaccounts no longer have Plan & Billing or Usage pages under Workspace Settings. |
| Client subscriptions | Subscriptions collected through Synthflow stopped working. |
| Minute top-ups | Synthflow no longer buys or tops up minutes for a subaccount from a pricing plan. |
| Other names for it | “Custom pricing” and “Connected Accounts” refer to the same feature. |
What did not change
- Your own Synthflow account. Your plan, your invoices and the minute pool on your parent account did not change because of this removal.
- Subaccounts. Each client still has a separate workspace with its own agents, contacts, phone numbers and call history.
- Branding and domain. Your agency name, logo, brand colour and custom domain continue to work.
- Permissions and products. You still decide which features each subaccount sees, and you can still push agents, workflows and actions into client workspaces.
- Usage caps. Limits & Capabilities still sets included minutes, concurrent calls, agent counts and workflow runs for each subaccount. Synthflow now describes it as the primary way to cap subaccount usage.
Who is affected
Synthflow's page is specific. You are affected if you connected your own Stripe account to Synthflow and billed clients through its custom pricing tiers. You are not affected if you manage subaccounts without custom pricing plans, for example because you already invoice clients yourself.
What now falls on you
| Job | Before September 15 | Now |
|---|---|---|
| Charging the client | Synthflow charged the plan price through your connected Stripe account. | You charge them from your own Stripe account or another billing system. |
| A client runs out of minutes | Plan rules handled it: calls stopped, or minutes were topped up or billed as overage, depending on the plan. | You raise the limit by hand, or switch on auto-overage so calls continue. Either way the minutes come from your pool. |
| Overage | Billed to the client at the rate on the plan. | With auto-overage on, extra minutes are billed to your account at your per-minute rate. You track them and invoice the client. |
| Spend ceiling | The plan's maximum minutes applied. | Synthflow's page says nothing stops a high-volume client from using a large number of minutes, and that auto-overage has no ceiling. You set conservative limits or carry the exposure. |
| Margin | Synthflow calculated the difference between its rate and the rate on your plan. | You work it out in your own billing system. |
| The client's view of usage | Plan & Billing and Usage pages in the subaccount. | Removed. You report usage to clients from your own systems. |
Four checks to make this week
| Check | How | What it tells you |
|---|---|---|
| Which clients were on a pricing plan | In Synthflow, open Settings, Partner, Subscriptions. If Subscriptions is not in the sidebar, Synthflow says to open any Partner page and set the page parameter in the URL to subscriptions. The Subaccounts API also returns each subaccount's subscription fields. | The list of clients whose billing ran through Synthflow. |
| What Stripe is doing | Open your own Stripe account and review the subscriptions for the products you used for Synthflow reselling. | Whether each client is still being charged, and for what. Do not assume either way. |
| Who can overrun | Open each subaccount's Limits & Capabilities tab: included minutes, auto-overage, concurrent calls. | Which clients can use more minutes than they pay for. |
| Usage since September 15 | Read minutes_used for each subaccount from the Subaccounts API, or add up call durations from the Calls API. | What each client has used, so you can invoice it. |
What to do next
Synthflow's own list has four steps, and they apply whether you stay or move:
- Find the affected subaccounts, including any that were on trials or usage-based overage.
- Recreate billing for those clients in your own Stripe products and subscriptions, invoices or another system.
- Set the minute and concurrency caps you want in Limits & Capabilities, because plan limits no longer apply.
- Put usage tracking in place so you can invoice overage yourself.
After that, the question is whether you want to keep running billing by hand. Replacing Synthflow rebilling sets out the three ways to do it, and Synthflow alternatives for agencies compares staying with moving.
Frequently asked questions
Did Synthflow shut down?
What exactly did Synthflow remove?
Is my Stripe account still connected to Synthflow?
Are my clients still being charged?
Did my own Synthflow plan or pricing change?
Can I still run an agency on Synthflow?
Why did Synthflow remove reselling?
Where do my clients see their plan and usage now?
Sources
- 1.Synthflow documentation: Reselling Synthflow's own account of the removal: what stopped on September 15, 2026, who is affected, what stays the same, and how to track and bill subaccounts now. Read on November 5, 2026.
- 2.Synthflow documentation: Stripe States that the Stripe integration for reselling was removed, that connected accounts were disconnected, and that agencies can still run subaccounts without it. Read on November 5, 2026.
- 3.Synthflow documentation: Custom Pricing (deprecated) The page for the removed feature, still published with a deprecation notice. Used for what pricing plans did: monthly fee, currencies, trials, minute and concurrency limits, overage. Read on November 5, 2026.
- 4.Synthflow documentation: Subaccounts What a subaccount is, that minutes come from the agency pool, that a subaccount cannot be moved between agencies, and what happens on deletion. Read on November 5, 2026.
- 5.Synthflow documentation: Limits & Capabilities Included minutes, auto-overage and who pays for it, concurrent calls, agent and workflow limits. Read on November 5, 2026.
- 6.Synthflow documentation: Billing Overview States that Synthflow no longer bills subaccounts, and that existing workspaces are governed by their own agreement rather than public documentation. Read on November 5, 2026.
- 7.Synthflow website Online and offering demos when we checked. Describes Synthflow as an enterprise conversational AI platform. Read on November 5, 2026.
Centerfy publishes this guide and offers an alternative to Synthflow. Synthflow is an operating company; statements about it are limited to the sources above, read on the dates given, and its product may have changed since. Descriptions of other vendors summarise their public documentation. Source: https://centerfy.ai/resources/synthflow/what-changed