Integration
Connect PostStack to InvoiceXpress
When Contact Updated (instant) fires in PostStack, your agent runs Create Invoice in InvoiceXpress. Describe the whole flow and it is built, tested on every scenario and kept running.
What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it.
Build solutions, not workarounds.
What do you want PostStack and InvoiceXpress to do together?
Ask the assistant
Connect your AI client
Give your AI client this address.
https://mcp.apiant.aiOne 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.aiStart Claude Code there, approve the server, and sign in in the browser page it opens.
Claude Code guide (opens in a new tab)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)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)Zed
Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server.
Setup guide (opens in a new tab)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)Grok
Open grok.com/connectors, choose New Connector, then Custom, and paste the address. Grok signs you in in your browser.
Setup guide (opens in a new tab)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)Example flows
What PostStack can start in InvoiceXpress
When Contact Updated (instant) in PostStack
then Create Invoice in InvoiceXpress
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 PostStack and InvoiceXpress
Triggers and actions 7 triggers · 63 actions
- Contact Deleted (instant)
Fires when a contact is deleted (event: contact.deleted).
- Contact Updated (instant)
Fires when a contact is updated (event: contact.updated).
- Email Bounced (instant)
Fires when an email bounces (event: email.bounced).
- Email Delivered (instant)
Fires when an email is delivered (event: email.delivered).
- New Contact (instant)
Fires when a contact is created (event: contact.created).
- New Inbound Email
Polls for newly received inbound emails.
- New Sent Email (instant)
Fires when an email is sent (event: email.sent).
- Add a broadcast
Create a new marketing broadcast.
- Add a contact
Create a new contact.
- Add a segment
Create a new manual contact segment.
- Add a template
Create a new email template.
- Add contacts to segment
Add contacts to an existing segment.
- Add suppression
Add an address to the suppression list.
- Cancel broadcast
Cancel an in-flight broadcast.
- Cancel email
Cancel a scheduled or queued email before it sends.
- Delete a contact
Delete a contact.
- Delete a template
Delete an email template.
- Get a contact
Fetch one contact by ID.
- Get a template
Fetch one email template by ID.
- Get broadcast
Retrieve one broadcast by its public id, including the HTML and text bodies that the list endpoint omits.
- Get email
Fetch one sent or queued email by ID.
- Get email events
Get the delivery event timeline for one email.
- Get inbound email
Fetch one received inbound email by ID.
- Import contacts
Bulk-import a CSV list of contacts.
- List broadcasts
List marketing broadcasts.
- List contacts
List contacts in the account.
- List emails
List sent, queued, and scheduled emails.
- List inbound emails
List emails received via inbound parsing.
- List segments
List contact segments.
- List suppressed addresses
List addresses on the suppression list.
- List templates
List email templates.
- Send an email
Send a transactional email through PostStack.
- Send broadcast
Start sending a broadcast to its recipients.
- Send emails in batch
Send up to 100 emails in a single request.
- Update a contact
Update an existing contact's fields.
- Update a template
Update an email template, creating a new version.
- Update email
Reschedule a queued email's send time.
- Validate email address
Check whether an email address is valid and deliverable.
- Add estimate
Creates a new estimate document (quote, proforma or fees note) in InvoiceXpress, with its line items and client.
- Add guide
Creates a shipping, transport or devolution (return) guide for goods, with its items, load and delivery addresses and client.
- Add item
Creates a new product or service item in your InvoiceXpress catalog.
- Add sequence
Creates a new document sequence (series) in InvoiceXpress and returns whether the request was accepted and where to check its status.
- Add tax
Creates a tax rate in InvoiceXpress and returns it.
- Cancel Invoice
Cancels a finalized InvoiceXpress invoice, recording the reason.
- Cancel Invoice-Receipt
Cancels a finalized InvoiceXpress invoice-receipt, recording the reason.
- Create Invoice
Creates a draft invoice in InvoiceXpress for a client, with its line items.
- Create Invoice-Receipt
Creates a draft invoice-receipt in InvoiceXpress for a client, with its line items.
- Delete Draft Invoice
Deletes a draft InvoiceXpress invoice.
- Delete Draft Invoice-Receipt
Deletes a draft InvoiceXpress invoice-receipt.
- Delete item
Deletes an item from your InvoiceXpress account.
- Finalize Invoice
Finalizes a draft InvoiceXpress invoice, giving it its legal number.
- Finalize Invoice-Receipt
Finalizes a draft InvoiceXpress invoice-receipt, giving it its legal number.
- Find clients by code
Finds the client whose client code matches the code you enter, and returns its details.
- Find clients by name
Finds a client by its exact name and returns the client record.
- Generate PDF
Generates the PDF of an InvoiceXpress invoice and returns its download link.
- Get a Client
Returns one InvoiceXpress client by its ID, with contact and fiscal details.
- Get a Invoice
Returns one InvoiceXpress invoice by its ID, with status, totals and client.
- Get estimate
Returns a single estimate (quote, proforma or fees note) with its client, line items and totals.
- Get item
Returns a single item (product or service) from your InvoiceXpress catalog, including its price, unit and tax.
- List clients
Returns all clients in your InvoiceXpress account.
- List invoices
Returns a list of invoices and other billing documents, optionally filtered by type, status, client, dates and totals.
- List items
Returns all the items (products and services) saved in your InvoiceXpress account.
- List sequences
Returns all document sequences (series) in your InvoiceXpress account, including their current document numbers and ATCUD validation codes.
- List taxes
Returns all the taxes configured in your InvoiceXpress account.
- Mark as Paid
Marks a finalized InvoiceXpress invoice as paid (settled).
- Sends Invoice by Email
Emails a finalized InvoiceXpress invoice to a recipient.
- Update estimate
Updates a draft estimate (quote, proforma or fees note), replacing its line items and details.
- Update Invoice
Updates a draft InvoiceXpress invoice; the line items you send replace the existing ones.
- Update Invoice-Receipt
Updates a draft InvoiceXpress invoice-receipt; the line items you send replace the existing ones.
- Update item
Updates an existing item's name, price, description, unit and tax.
No trigger or action matches that. Ask your agent to add it: it reads the API documentation and builds what you describe.
Each app on its own
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Questions
PostStack and InvoiceXpress, answered
What can start an automation from PostStack?
Any of PostStack's 7 triggers in the catalog, including Contact Updated (instant), New Contact (instant), New Inbound Email and New Sent Email (instant). Describe the moment in plain language and your agent picks the right one.
What can your agent do in InvoiceXpress when something happens in PostStack?
Any of InvoiceXpress's 32 actions, including Create Invoice, Create Invoice-Receipt, Update estimate and Update Invoice. Your agent maps the data both ways and tests every scenario before it ships.
Can it also run from InvoiceXpress to PostStack?
InvoiceXpress has no triggers in the catalog today, so automations start in PostStack. If you need the other direction, ask: your agent reads InvoiceXpress's API documentation and adds it.
Do I have to build a connector for PostStack or InvoiceXpress?
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 PostStack and InvoiceXpress 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.