--- title: "Connect Polar and PostStack - APIANT.ai" description: "When \"Benefit Created\" fires in Polar, your agent runs \"Add a contact\" in PostStack." canonical: "https://apiant.ai/connect/polar-to-poststack" --- # Connect Polar and PostStack When **Benefit Created** fires in [Polar](https://apiant.ai/connections/polar), your agent runs **Add a contact** in [PostStack](https://apiant.ai/connections/poststack), or **Contact Updated (instant)** in PostStack to **Create Customer** in Polar. Describe the whole flow and it is built, tested on every scenario and kept running. Polar **21** triggers Polar **26** actions PostStack **7** triggers PostStack **31** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want Polar and PostStack to do together? Give your AI client this address. `https://mcp.apiant.ai` One connection does both: ask your client to act in an app once, or have it build an automation that keeps running. Any client that takes a remote MCP server. Nothing to install. Create your free account, then sign in once in your browser. ### Set it up in your client ### Claude Code Run this in the directory you want to work in. `claude mcp add --transport http -s project apiant-ai https://mcp.apiant.ai` Start Claude Code there, approve the server, and sign in in the browser page it opens. [Claude Code guide (opens in a new tab)](https://apiant.ai/docs/mcp/claude-code) ### Claude, web and desktop Open Customize, then Connectors, then Add custom connector, and paste the address. On Team and Enterprise an owner adds it first. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Cursor Add the address to your MCP configuration as a server URL. Cursor signs you in in your browser. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Zed Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Codex and the ChatGPT desktop app Open Settings, then MCP servers, then Add server, and choose Streamable HTTP. From the terminal, Codex takes the address with its own add command and then signs you in. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Any other MCP client Paste the address where the client asks for a remote MCP server URL, and name the server apiant-ai where it lets you. APIANT's skills reach the client over the same connection. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) Example flows ## What Polar and PostStack can do together ### From Polar to PostStack - When **Benefit Created** in Polar then **Add a contact** in PostStack - When **Benefit Updated** in Polar then **Add contacts to segment** in PostStack ### From PostStack to Polar - When **Contact Updated (instant)** in PostStack then **Create Customer** in Polar - When **New Contact (instant)** in PostStack then **Add Subscription** in Polar Starting points drawn from the triggers and actions in the catalog today. Describe the flow you need, at any depth, and your agent builds it and tests every scenario before it ships. Everything your agent can do with Polar and PostStack ## Triggers and actions 28 triggers · 57 actions - Trigger **Benefit Created** Triggered when a new benefit is created in Polar. - Trigger **Benefit Updated** Triggered when a benefit is changed in Polar. - Trigger **Checkout Created** Triggered when a new checkout session is created in Polar. - Trigger **Checkout Expired** Triggered when a checkout session expires in Polar without being paid. - Trigger **Checkout Updated** Triggered when a checkout session changes in Polar, for example when it is confirmed or paid. - Trigger **Customer Created** Triggered when a new customer is created in Polar. - Trigger **Customer Deleted** Triggered when a customer is deleted in Polar. - Trigger **Customer State Changed** Triggered when a customer's state changes in Polar - their active subscriptions, granted benefits or meters. - Trigger **Customer Updated** Triggered when a customer's details change in Polar. - Trigger **Order Created** Triggers when a new order is placed in your Polar organization. - Trigger **Order Paid** Triggers when an order in your Polar organization is paid. - Trigger **Order Updated** Triggers when an order in your Polar organization changes. - Trigger **Product Created** Triggers when a new product is created in your Polar organization. - Trigger **Product Updated** Triggers when a product in your Polar organization changes. - Trigger **Subscription Active** Triggers when a subscription in your Polar organization becomes active. - Trigger **Subscription Canceled** Triggers when a customer cancels a subscription in your Polar organization. - Trigger **Subscription Created** Triggers when a new subscription is created in your Polar organization. - Trigger **Subscription Past Due** Triggers when a subscription in your Polar organization falls past due because a payment failed. - Trigger **Subscription Revoked** Triggers when a subscription in your Polar organization is revoked and the customer loses access. - Trigger **Subscription Uncanceled** Triggers when a customer reverses a pending cancellation and keeps a subscription in your Polar organization. - Trigger **Subscription Updated** Triggers when a subscription in your Polar organization changes. - Action **Add Subscription** Subscribes a customer to a free recurring product. - Action **Confirm Checkout Session** Completes an open checkout session so Polar creates the order. Works without payment only when the checkout needs none, for example a free product. - Action **Create Benefit** Creates a benefit in Polar that you can attach to products. - Action **Create Checkout Session** Creates a Polar checkout session for a product and returns the link the customer pays through. - Action **Create Customer** Creates a customer in Polar. - Action **Create Discount** Creates a discount in Polar, either a percentage off or a fixed amount off. - Action **Create Product** Creates a product in Polar with its price or prices. - Action **Delete Customer** Deletes a customer in Polar. Their subscriptions are cancelled and their benefits revoked. - Action **Get Checkout Session** Returns one Polar checkout session by its id, including its status and payment link. - Action **Get Customer** Returns one customer from Polar by their id, including any metadata you stored on them. - Action **Get Product** Returns one product from Polar by its id, with its prices and attached benefits. - Action **Get Subscription** Returns one subscription from Polar by its id, with its status, amount and current period. - Action **List Benefits** Returns a page of benefits from Polar. - Action **List Checkout Sessions** Returns a page of checkout sessions from Polar. - Action **List Customers** Returns a page of customers from Polar. - Action **List Discounts** Returns the discount codes set up in your Polar organization, newest first. You can narrow the list by organization or by name text, and page through the results. - Action **List Orders** Returns the orders placed in your Polar organization. You can narrow the list by product, customer, subscription, checkout, discount or status, and page through the results. - Action **List Products** Returns the products in your Polar organization, with their prices and benefits. You can narrow the list by name text, archived state, one-time versus subscription, or a benefit, and page through the results. - Action **List Subscriptions** Returns the subscriptions in your Polar organization. You can narrow the list by product, customer, discount, active state or status, and page through the results. - Action **Revoke Subscription** Cancels a Polar subscription immediately, ending the customer's access right away rather than at the end of the billing period. - Action **Update Benefit** Changes a benefit's description, visibility, settings or metadata. - Action **Update Checkout Session** Changes an open checkout session: buyer details, product, amount, metadata or redirect links. - Action **Update Customer** Updates an existing Polar customer. Only the fields you fill in are changed; anything left blank keeps its current value. - Action **Update Order** Changes the billing name or billing address shown on an order's invoice. - Action **Update Product** Updates an existing Polar product. Only the fields you fill in are changed; anything left blank keeps its current value. - Action **Update Subscription** Changes an existing Polar subscription — switch its product, apply a discount, adjust seats, move the trial end, or schedule or reverse a cancellation. Only the fields you fill in are changed. - Trigger **Contact Deleted (instant)** Fires when a contact is deleted (event: contact.deleted). - Trigger **Contact Updated (instant)** Fires when a contact is updated (event: contact.updated). - Trigger **Email Bounced (instant)** Fires when an email bounces (event: email.bounced). - Trigger **Email Delivered (instant)** Fires when an email is delivered (event: email.delivered). - Trigger **New Contact (instant)** Fires when a contact is created (event: contact.created). - Trigger **New Inbound Email** Polls for newly received inbound emails. - Trigger **New Sent Email (instant)** Fires when an email is sent (event: email.sent). - Action **Add a broadcast** Create a new marketing broadcast. - Action **Add a contact** Create a new contact. - Action **Add a segment** Create a new manual contact segment. - Action **Add a template** Create a new email template. - Action **Add contacts to segment** Add contacts to an existing segment. - Action **Add suppression** Add an address to the suppression list. - Action **Cancel broadcast** Cancel an in-flight broadcast. - Action **Cancel email** Cancel a scheduled or queued email before it sends. - Action **Delete a contact** Delete a contact. - Action **Delete a template** Delete an email template. - Action **Get a contact** Fetch one contact by ID. - Action **Get a template** Fetch one email template by ID. - Action **Get broadcast** Retrieve one broadcast by its public id, including the HTML and text bodies that the list endpoint omits. - Action **Get email** Fetch one sent or queued email by ID. - Action **Get email events** Get the delivery event timeline for one email. - Action **Get inbound email** Fetch one received inbound email by ID. - Action **Import contacts** Bulk-import a CSV list of contacts. - Action **List broadcasts** List marketing broadcasts. - Action **List contacts** List contacts in the account. - Action **List emails** List sent, queued, and scheduled emails. - Action **List inbound emails** List emails received via inbound parsing. - Action **List segments** List contact segments. - Action **List suppressed addresses** List addresses on the suppression list. - Action **List templates** List email templates. - Action **Send an email** Send a transactional email through PostStack. - Action **Send broadcast** Start sending a broadcast to its recipients. - Action **Send emails in batch** Send up to 100 emails in a single request. - Action **Update a contact** Update an existing contact's fields. - Action **Update a template** Update an email template, creating a new version. - Action **Update email** Reschedule a queued email's send time. - Action **Validate email address** Check whether an email address is valid and deliverable. ## Each app on its own - [ **Polar** Polar is a modern billing platform for developers & designers.](https://apiant.ai/connections/polar) - [ **PostStack** EU-hosted email API for transactional and marketing email, with contacts, broadcasts, and analytics](https://apiant.ai/connections/poststack) Reviews ## What our customers say ## More from Polar - [ **Polar to GoHighLevel** All-in-one sales and marketing platform agencies white-label and resell to their clients — contacts...](https://apiant.ai/connect/polar-to-gohighlevel) - [ **Polar to Chucknorris** Free JSON API providing hand-curated, random Chuck Norris jokes/facts.](https://apiant.ai/connect/polar-to-chucknorris) - [ **Polar to PaperClean** Clean document photos for printing, remove shadows, fix lighting](https://apiant.ai/connect/polar-to-paperclean) - [ **Polar to Sportmonks Cricket** Live cricket score, player statistics and fantasy API](https://apiant.ai/connect/polar-to-sportmonks-cricket) - [ **Polar to Temi** Temi is an audio transcription service that uses computers to transcribe English audio or video into text.](https://apiant.ai/connect/polar-to-temi) - [ **Polar to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/polar-to-salesforce) ## More into PostStack - [ **HubSpot to PostStack** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-poststack) - [ **Google Sheets to PostStack** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/google-sheets-to-poststack) - [ **Gmail to PostStack** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-poststack) - [ **Google Calendar to PostStack** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-poststack) - [ **Google Drive to PostStack** Google Drive is a cloud storage solution for uploading, sharing, and collaborating on files across devices...](https://apiant.ai/connect/google-drive-to-poststack) - [ **Mailchimp to PostStack** Mailchimp marketing automation and email platform.](https://apiant.ai/connect/mailchimp-to-poststack) Questions ## Polar and PostStack, answered ### ### What can start an automation from Polar? Any of Polar's 21 triggers in the catalog, including Benefit Created, Benefit Updated, Checkout Created and Checkout Updated. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in PostStack when something happens in Polar? Any of PostStack's 31 actions, including Send an email, Send broadcast, Send emails in batch and Update a contact. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from PostStack to Polar? Yes. When something happens in PostStack, your agent can act in Polar too. This page covers both directions: PostStack's triggers and Polar's actions are listed here as well. ### ### Do I have to build a connector for Polar or PostStack? No. Both are in the catalog with their triggers and actions. You describe the automation; your agent builds it, tests every scenario and keeps it running. ### ### Can my AI client use Polar and PostStack without building an automation? Yes. With your AI client connected to APIANT, ask it to do something in either app once and it runs that action on the spot. Ask for an automation and your agent builds it, tests every scenario and keeps it running. One connection covers both. ### ### What happens when something fails? Your agent works that out for you. It plans the failure paths along with the happy path, then tests every scenario before it ships. ### ### Is there a free plan? Yes. Every plan includes the agent, including free, and building from your own AI client spends no assistant credits.