List tin

Reads a payee's TIN in full — and, for a payee on a W-8, its foreign TIN, which the payer's Form 1042-S carries.

GET /v1/tax/w9/{id}/tin

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Address	`https://api.hanzo.ai/v1/tax/w9/{id}/tin`
Method	`GET`
Operation	`get_tax_w9_by_id_tin`
Auth	`Authorization: Bearer $HANZO_API_KEY`

Reads a payee's TIN in full — and, for a payee on a W-8, its foreign TIN, which the payer's Form 1042-S carries. Only an org admin of the PAYER, only while the payee's grant is live, and every read is on the audit trail before a number is answered — a read the trail cannot record is refused.

This is the one place a TIN leaves the platform in full, apart from the IRS filing export. SuperAdmin is not admitted: platform authority is not a reason to read a company's TIN.

Request

1 field.

Field	In	Type	Required	Description
`id`	path	string	yes	ID is the relationship's id, "w9_"-prefixed.

Response

Status	Body	Meaning
`200`	tax.tinOut	ok
`default`	problem-details	refused

200 body — 3 fields.

Field	In	Type	Always	Description
`foreignTin`	body	string	—	ForeignTIN is a W-8 payee's foreign tax identifying number as issued, which Form 1042-S carries for a foreign recipient.
`tin`	body	string	—	TIN is the payee's full U.S. taxpayer identification number, hyphenated as the IRS writes it; empty when a W-8 carries none.
`tinType`	body	string	—	TINType is ssn or ein.

Failure carries the platform error shape — see Errors.

Examples

CLI

SDK

HTTP

MCP

hanzo has no subcommand for this operation — the CLI serves only what cloud's live route table confirms. Use HTTP or an SDK.

.ts

.py

.go

.rs

.java

import { Configuration, TaxApi } from 'hanzoai';

const api = new TaxApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.getTaxW9ByIdTin({ id: 'id' });

from hanzoai.cloud import ApiClient, Configuration
from hanzoai.cloud.api import TaxApi

client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = TaxApi(client).get_tax_w9_by_id_tin(id='id')

cfg := hanzoai.NewConfiguration()
cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY"))
client := hanzoai.NewAPIClient(cfg)

resp, _, err := client.TaxAPI.GetTaxW9ByIdTin(context.Background()).Execute()
if err != nil {
	return err
}

use hanzo_client::apis::{configuration::Configuration, tax_api};

let mut cfg = Configuration::new();
cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok();

let result = tax_api::get_tax_w9_by_id_tin(&cfg, Default::default()).await?;

import ai.hanzo.cloud.ApiClient;
import ai.hanzo.cloud.api.TaxApi;

ApiClient client = new ApiClient();
client.setBearerToken(System.getenv("HANZO_API_KEY"));

var result = new TaxApi(client).getTaxW9ByIdTin();

curl https://api.hanzo.ai/v1/tax/w9/<id>/tin \
  -H "Authorization: Bearer $HANZO_API_KEY"

MCP reaches tax through the tax tool, which names its 26 operations with its own verbs — this one among them, under a name only MCP declares. describe explains any of them:

curl -X POST https://api.hanzo.ai/v1/mcp \
  -H "Content-Type: application/json" \
  -d '{
       "jsonrpc": "2.0",
       "id": 1,
       "method": "tools/call",
       "params": {
         "name": "describe",
         "arguments": {
           "op": "list_tax_filings"
         }
       }
     }'

Tax API · All Hanzo APIs · Interactive reference

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