--- title: "Connect PassEngine to OnceOnly - APIANT.ai" description: "When \"New Client\" fires in PassEngine, your agent runs \"Add event\" in OnceOnly." canonical: "https://apiant.ai/connect/passengine-to-onceonly" --- # Connect PassEngine to OnceOnly When **New Client** fires in [PassEngine](https://apiant.ai/connections/passengine), your agent runs **Add event** in [OnceOnly](https://apiant.ai/connections/onceonly). Describe the whole flow and it is built, tested on every scenario and kept running. PassEngine **4** triggers PassEngine **11** actions OnceOnly **11** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want PassEngine and OnceOnly 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 PassEngine can start in OnceOnly - When **New Client** in PassEngine then **Add event** in OnceOnly - When **New Pass** in PassEngine then **Add policy** in OnceOnly 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 PassEngine and OnceOnly ## Triggers and actions 4 triggers · 22 actions - Trigger **New Client** Triggers when a new client is created. - Trigger **New Pass** Triggers when a new pass is created in PassEngine. - Trigger **Pass Scanned** Triggers each time a pass is successfully scanned, with the pass code, scan result, location and the operator who scanned it. - Trigger **Pass Status Changed** Triggers when a pass status changes (active, used, expired, revoked). - Action **Activate Pass** Reactivates a pass, setting its status back to active and notifying wallet apps. - Action **Create Client** Creates a client (customer) in PassEngine with a name and optional email, phone and internal notes. - Action **Create Pass** Creates a new single-use or multi-use pass, optionally attached to a client and emailed to a recipient. Returns the new pass with its code and public link. - Action **Get client** Returns a single client (customer) by ID, including their name, email, phone and notes. - Action **Get pass** Returns a pass by its ID, including its custom fields, attached client, recent email deliveries and public URL. - Action **List clients** Returns the clients in your PassEngine account, optionally filtered by name, email or phone. - Action **List passes** Returns the passes in your PassEngine account, optionally filtered by name/code text or status. - Action **Revoke Pass** Revokes a pass so it can no longer be scanned, and notifies wallet apps of the change. - Action **Scan Pass** Scans (redeems) a pass by its code, validating its status, validity dates and usage limits, and records the scan. Returns whether the scan succeeded and, if not, why. - Action **Send pass email** Emails an existing pass to a recipient. Returns the queued email delivery with its status. - Action **Update Pass** Updates an existing pass's label, note, status, scan limit, validity dates or custom fields. Changing the status notifies subscribers that the pass status changed. - Action **Add event** Adds an event to an agent run's timeline in OnceOnly, such as a step starting, a tool call, or a failure. - Action **Add policy** Creates or updates the governance policy for an agent, such as rate limits, spend limits and allowed or blocked tools. - Action **Add tool** Creates or updates a tool in your OnceOnly tool registry, pointing at your backend URL. Returns the saved tool without its secret. - Action **Check & Lock** Checks an idempotency key and locks it if it is new, telling you whether the event is a first occurrence or a duplicate. - Action **Delete tool** Permanently deletes a tool from your OnceOnly tool registry. - Action **Get policy** Returns the governance policy configured for an agent. - Action **Get run** Returns a run's timeline: the run id, the total number of events and the list of events recorded for it. - Action **Get tool** Returns the details of a registered tool by name, including its URL, scope, enabled state and retry settings. - Action **List policies** Returns every agent policy on the OnceOnly account, each with its agent id and policy settings. - Action **List runs** Returns the runs recorded on your OnceOnly account, with each run's latest status and event count. - Action **List tools** Returns the tools registered in your OnceOnly tool registry for a scope. ## Each app on its own - [ **PassEngine** PassEngine is a platform for creating and managing virtual membership cards and QR passes for events...](https://apiant.ai/connections/passengine) - [ **OnceOnly** OnceOnly is an idempotency API that prevents duplicate automation runs by blocking repeated events in...](https://apiant.ai/connections/onceonly) Reviews ## What our customers say ## More from PassEngine - [ **PassEngine to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/passengine-to-salesforce) - [ **PassEngine to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/passengine-to-slack) - [ **PassEngine to Stripe** Stripe is a payment processing platform for online businesses.](https://apiant.ai/connect/passengine-to-stripe) - [ **PassEngine to Shopify** Shopify is a commerce platform for online stores and retail point-of-sale.](https://apiant.ai/connect/passengine-to-shopify) - [ **PassEngine to QuickBooks Online** QuickBooks Online accounting — manage customers, invoices, bills, payments, vendors, expenses, and more via...](https://apiant.ai/connect/passengine-to-quickbooks-online) - [ **PassEngine to Pipedrive** Pipedrive is a sales CRM and pipeline management tool.](https://apiant.ai/connect/passengine-to-pipedrive) ## More into OnceOnly - [ **HubSpot to OnceOnly** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-onceonly) - [ **Salesforce to OnceOnly** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/salesforce-to-onceonly) - [ **Slack to OnceOnly** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/slack-to-onceonly) - [ **Google Sheets to OnceOnly** Google Sheets](https://apiant.ai/connect/google-sheets-to-onceonly) - [ **Gmail to OnceOnly** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-onceonly) - [ **Google Calendar to OnceOnly** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-onceonly) Questions ## PassEngine and OnceOnly, answered ### ### What can start an automation from PassEngine? Any of PassEngine's 4 triggers in the catalog, including New Client, New Pass, Pass Status Changed and Pass Scanned. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in OnceOnly when something happens in PassEngine? Any of OnceOnly's 11 actions, including Add event, Add policy, Add tool and Check & Lock. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from OnceOnly to PassEngine? OnceOnly has no triggers in the catalog today, so automations start in PassEngine. If you need the other direction, ask: your agent reads OnceOnly's API documentation and adds it. ### ### Do I have to build a connector for PassEngine or OnceOnly? 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 PassEngine and OnceOnly 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.