MoonClerk collects one-time and recurring payments through its hosted forms. FlowMattic posts what happens next to Slack: failed plan payments to billing, successful payments to the team, ended plans to whoever looks after retention. For small businesses, nonprofits and clubs that bill members or donors through MoonClerk.
5 triggers 14 actions 6 example workflows 2 ready-made templates Unlimited runs
When this happens in MoonClerk5 triggers
Do this in Slack14 actions
1. TriggerPlan Payment Failed2. ActionSend Channel MessageWhen MoonClerk fires Plan Payment Failed, FlowMattic runs Send Channel Message in Slack with the data from that event.
You build this in the FlowMattic workflow builder on your own site. See the setup steps
Each one uses only triggers and actions the two integrations ship today, plus FlowMattic's own tools. Where the library has a ready-made template, import it instead of building from scratch.
Ready-made templateEach failed recurring charge posts the payer, form and amount to the billing channel, so someone can contact the customer before the next retry instead of finding out at month end.
Plan Payment FailedSend Channel Message
View the template Number Formatter turns the amount into a readable currency figure before Send Channel Message posts it, so the sales or donations channel reads like a running tally of the day.
Payment SuccessfulNumber FormatterSend Channel Message
Payment Created fires for payments in any state. A Router reads the status and posts successes to the team channel and failures to a billing channel that only finance watches.
Payment CreatedRouterSend Channel MessageSend Private Channel Message
When a member cancels or runs out of payments, the retention channel gets the details and Add Reminder sets a nudge to contact them in a few days.
Plan EndedSend Private Channel MessageAdd Reminder
Plan Created posts the new subscriber and their plan to the team, so a membership organiser or account manager can send a personal hello the same day.
Plan CreatedSend Channel Message
A Branch checks the amount. Small failures stay in the billing channel, while large ones reach the finance lead directly so a big account is not left to automatic retries.
Plan Payment FailedBranchSend Direct Message
At the end, every failed MoonClerk plan payment posts the payer and amount in your billing channel.
Under Connects in FlowMattic, add the Slack workspace where billing alerts should go.
Create a workflow with MoonClerk and the Plan Payment Failed trigger, then follow the setup instructions on the trigger step.
Send a test from MoonClerk or wait for a real failure, so FlowMattic has the payment fields to map.
Add Slack Send Channel Message, pick the billing channel, map the payer, email, form and amount, test it and switch the workflow on.
1. Trigger in MoonClerk
Plan Payment Failed
2. Action in Slack
Send Channel Message
Fields mapped from the earlier steps (a typical setup)
| From MoonClerk | To Slack |
|---|---|
| Payer name | Message: customer |
| Message: email | |
| Form name | Message: form |
| Amount | Message: amount |
| Plan ID | Message: plan |
A trigger starts a workflow. An action is something FlowMattic does in the app as a step.
MoonClerk and Slack connect through FlowMattic on your own site, with no separate automation account in the middle and no charge per run.
A failed recurring payment lands where someone owns it, with the payer's details ready, instead of waiting for a monthly report.
Payment events pass through your own WordPress server on the way to Slack, not through another company's automation account.
Runs are unlimited on every FlowMattic plan, so a busy donation drive costs the same as a quiet month.
Create a FlowMattic workflow with a MoonClerk trigger such as Payment Successful or Plan Payment Failed, follow its setup instructions, then add Slack Send Channel Message with the payment fields mapped into the text.
Payment Successful when you only want money that came in. Payment Created when you want every attempt, including failures, and plan to sort them with a Router on the status.
Yes. Plan Ended fires when a plan is cancelled or its set number of payments is used up. Post it to a retention channel and add a reminder to follow up.
Yes. Add a Router on the form name and give each path its own Slack step, for example one channel for memberships and another for event fees.
No. FlowMattic only reads the events MoonClerk sends and posts them to Slack. Retries and dunning stay as you have them set in MoonClerk.
Did not find your answer? You can browse the help center or ask us directly.
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Reviewed 27 Oct 2026. The example workflows are written with AI from the real triggers and actions of both integrations and checked against them. MoonClerk integration 1.0.0, Slack integration 1.0.
