--- title: "Connect eSignatures to Tax ID Pro - APIANT.ai" description: "When \"Contract Signed\" fires in eSignatures, your agent runs \"Validate tax ID\" in Tax ID Pro." canonical: "https://apiant.ai/connect/esignatures-to-tax-id-pro" --- # Connect eSignatures to Tax ID Pro When **Contract Signed** fires in [eSignatures](https://apiant.ai/connections/esignatures), your agent runs **Validate tax ID** in [Tax ID Pro](https://apiant.ai/connections/tax-id-pro). Describe the whole flow and it is built, tested on every scenario and kept running. eSignatures **4** triggers eSignatures **11** actions Tax ID Pro **3** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want eSignatures and Tax ID Pro 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 eSignatures can start in Tax ID Pro - When **Contract Signed** in eSignatures then **Validate tax ID** in Tax ID Pro - When **Contract Withdrawn** in eSignatures then **Validate tax IDs in batch** in Tax ID Pro 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 eSignatures and Tax ID Pro ## Triggers and actions 4 triggers · 14 actions - Trigger **Contract Signed** Triggers when a contract is signed by all signers. - Trigger **Contract Withdrawn** Fires when a sent contract is withdrawn/cancelled before signing completes. Webhook event "Contract withdrawn". - Trigger **Signer Declined Signature** Fires when a signer declines to sign the contract. Webhook event "Signer declined the signature". - Trigger **Signer Viewed Contract** Fires when a signer opens/views the contract. Webhook event "Signer viewed the contract". - Action **Add Signer** Add a new signer to an existing contract. - Action **Add Template** Create a new reusable contract template. - Action **Create Contract** Creates a new contract. - Action **Delete Signer** Remove a signer from a contract that has not yet signed. - Action **Delete Template** Delete a contract template. - Action **Get Contract** Retrieve a contract's current status, signer states, and metadata. - Action **Get Template** Retrieve a contract template's details. - Action **List Templates** List all contract templates in the account. - Action **Send Contract Draft** Send a previously created draft contract to its signers. - Action **Update Template** Update an existing contract template's title or settings. - Action **Withdraw Contract** Withdraw (cancel) a contract that has been sent but not fully signed. - Action **List formats** Returns every tax ID format Tax ID Pro supports, with its country, name, abbreviation and whether it applies to individuals, entities or VAT. - Action **Validate tax ID** Checks whether a tax ID number is valid for a given country and returns its compact and standard formats, the country name and the format name, or a message explaining why it is invalid. - Action **Validate tax IDs in batch** Checks a list of tax ID numbers from many countries in one run and returns a validity result for each, matched back by your own reference. ## Each app on its own - [ **eSignatures** ESignatures.io is a tool used for signing mobile friendly contracts over the web.](https://apiant.ai/connections/esignatures) - [ **Tax ID Pro** API and tools to validate tax ID numbers for 100+ countries in real time.](https://apiant.ai/connections/tax-id-pro) Reviews ## What our customers say ## More from eSignatures - [ **eSignatures to Pexafy** Semantic image search across 9+ free stock photo sources with a unified JSON schema](https://apiant.ai/connect/esignatures-to-pexafy) - [ **eSignatures to HubSpot** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/esignatures-to-hubspot) - [ **eSignatures to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/esignatures-to-salesforce) - [ **eSignatures to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/esignatures-to-slack) - [ **eSignatures to Google Sheets** Google Sheets](https://apiant.ai/connect/esignatures-to-google-sheets) - [ **eSignatures to Google Calendar** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/esignatures-to-google-calendar) ## More into Tax ID Pro - [ **HubSpot to Tax ID Pro** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-tax-id-pro) - [ **Salesforce to Tax ID Pro** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/salesforce-to-tax-id-pro) - [ **Slack to Tax ID Pro** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/slack-to-tax-id-pro) - [ **Google Sheets to Tax ID Pro** Google Sheets](https://apiant.ai/connect/google-sheets-to-tax-id-pro) - [ **Gmail to Tax ID Pro** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-tax-id-pro) - [ **Google Calendar to Tax ID Pro** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-tax-id-pro) Questions ## eSignatures and Tax ID Pro, answered ### ### What can start an automation from eSignatures? Any of eSignatures's 4 triggers in the catalog, including Contract Signed, Contract Withdrawn, Signer Declined Signature and Signer Viewed Contract. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in Tax ID Pro when something happens in eSignatures? Any of Tax ID Pro's 3 actions, including List formats, Validate tax ID and Validate tax IDs in batch. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from Tax ID Pro to eSignatures? Tax ID Pro has no triggers in the catalog today, so automations start in eSignatures. If you need the other direction, ask: your agent reads Tax ID Pro's API documentation and adds it. ### ### Do I have to build a connector for eSignatures or Tax ID Pro? 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 eSignatures and Tax ID Pro 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.