Integration
Connect Rex to CII & UBL by InvoiceXML
When Appraisal Created fires in Rex, your agent runs Create CII Invoice in CII & UBL by InvoiceXML. 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 Rex and CII & UBL by InvoiceXML 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 Rex can start in CII & UBL by InvoiceXML
When Appraisal Created in Rex
then Create CII Invoice in CII & UBL by InvoiceXML
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 Rex and CII & UBL by InvoiceXML
Triggers and actions 14 triggers · 21 actions
- Appraisal Created
Triggers when a new appraisal is created in Rex.
- Calendar Event Created
Triggers when a new calendar event is created in Rex.
- Calendar Event Updated
Triggers when a calendar event is updated in Rex.
- Contact Created
Triggers when a new contact is created in Rex.
- Contact Updated
Triggers when a contact is updated in Rex.
- Contract Created
Triggers when a new contract is created in Rex.
- Contract Status Changed
Triggers when a Rex contract's status changes.
- Lead Created
Triggers when a new lead is received or created in Rex.
- Listing Created
Triggers when a new listing is created in Rex.
- Listing Published
Triggers when a Rex listing is published.
- Listing Sold/Leased
Triggers when a Rex listing is marked as sold or leased.
- Listing Updated
Triggers when a listing is updated in Rex.
- Note Created
Triggers when a new note is created in Rex.
- Property Updated
Triggers when a property is updated in Rex.
- Add Tag
Adds a tag to a Rex contact.
- Assign Lead
Assigns an existing Rex lead to a user.
- Create Lead
Creates a lead in Rex, optionally linked to a contact and listing and assigned to a user.
- Create Match Profile
Creates a buyer/renter match profile for a Rex contact.
- Create Note
Creates a note in Rex, optionally linked to a contact.
- Create Reminder
Creates a reminder in Rex for the record owner, optionally linked to a contact.
- Search for Full Calendar Event
Returns the latest full data for a Rex calendar event by its ID.
- Convert CII to UBL
Translates a UN/CEFACT CII invoice XML into a standards-compliant UBL 2.1 XML document, enabling interoperability between systems that use different e-invoice formats.
- Convert UBL to CII
Transforms a UBL 2.1 invoice XML into a UN/CEFACT CII XML document, bridging compatibility between PEPPOL-based systems and CII-native accounting platforms.
- Create CII Invoice
Produces a UN/CEFACT Cross-Industry Invoice (CII) XML document from structured billing data, ready for submission through any EN16931-compliant e-invoicing channel.
- Create UBL Invoice
Generates a standards-compliant UBL 2.1 XML invoice from structured billing data including seller, buyer, line items, and payment details.
- Extract Invoice Attachments
Download an e-invoice's embedded attachments as a ZIP.
- Extract Invoice JSON
Parses a PDF invoice into machine-readable JSON, reading embedded CII or UBL XML when available and applying AI-based extraction as a fallback for unstructured PDFs.
- Extract Invoice XML
Pull the CII or UBL XML out of an e-invoice PDF.
- Parse Invoice JSON
AI-parse any PDF invoice — messy, scanned, or handwritten — into structured JSON.
- Render CII to PDF
Produce a human-readable PDF from a CII e-invoice.
- Render UBL to PDF
Produce a human-readable PDF from a UBL e-invoice.
- Transform PDF to CII
Reads an existing PDF invoice and produces a UN/CEFACT CII XML document using AI-powered data extraction. Ideal for digitising paper-based or scanned invoices into a structured CII format. Note: AI can make mistakes; review output before sending.
- Transform PDF to UBL
Reads an existing PDF invoice and produces a UBL 2.1 XML document using AI-powered data extraction. Useful for onboarding legacy invoices into structured e-invoicing workflows. Note: AI can make mistakes; review output before sending.
- Validate CII Invoice
Verifies a UN/CEFACT CII invoice XML against EN16931 semantic rules and XSD schema, returning a detailed compliance report including any rule failures or data inconsistencies.
- Validate UBL Invoice
Checks a UBL 2.1 invoice XML against EN16931 business rules and schema constraints, returning a structured validation report with any rule violations or structural errors.
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
Reviews
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Questions
Rex and CII & UBL by InvoiceXML, answered
What can start an automation from Rex?
Any of Rex's 14 triggers in the catalog, including Appraisal Created, Calendar Event Created, Calendar Event Updated and Contact Created. Describe the moment in plain language and your agent picks the right one.
What can your agent do in CII & UBL by InvoiceXML when something happens in Rex?
Any of CII & UBL by InvoiceXML's 14 actions, including Create CII Invoice, Create UBL Invoice, Convert CII to UBL and Convert UBL to CII. Your agent maps the data both ways and tests every scenario before it ships.
Can it also run from CII & UBL by InvoiceXML to Rex?
CII & UBL by InvoiceXML has no triggers in the catalog today, so automations start in Rex. If you need the other direction, ask: your agent reads CII & UBL by InvoiceXML's API documentation and adds it.
Do I have to build a connector for Rex or CII & UBL by InvoiceXML?
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 Rex and CII & UBL by InvoiceXML 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.