Call it from JavaScript and Python

import { readFile } from "node:fs/promises";

const AITYX = "https://api.aityx.ai";
const model = JSON.parse(await readFile("invoice-model.json", "utf8"));

export async function decidePayment(invoice) {
  const res = await fetch(`${AITYX}/v1/systemone`, {
    method: "POST",
    headers: {
      Authorization: `Bearer ${process.env.AITYX_API_KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      model,
      state: {
        invoice_amount: invoice.amountUsd,
        invoice_date: invoice.issuedOn,
        payment_on: invoice.paymentOn,
        approved: invoice.approved,
      },
    }),
  });
  const result = await res.json();
  if (!res.ok) {
    if (result.code === "invalid_state") {
      return { outcome: "needs_facts", missing: result.errors.map(e => e.path) };
    }
    throw new Error(`aityx ${res.status}: ${result.detail ?? "request failed"}`);
  }
  return {
    outcome: result.answers.payment_action.choice,
    payableUsd: result.answers.payable_amount.number,
    discountBy: result.answers.discount_by.date,
    receipt: result.receipt,
    billing: result.billing,
  };
}

import json
import os
import requests

AITYX = "https://api.aityx.ai"
with open("invoice-model.json") as file:
    model = json.load(file)


def decide_payment(invoice: dict) -> dict:
    res = requests.post(
        f"{AITYX}/v1/systemone",
        headers={"Authorization": f"Bearer {os.environ['AITYX_API_KEY']}"},
        json={
            "model": model,
            "state": {
                "invoice_amount": invoice["amount_usd"],
                "invoice_date": invoice["issued_on"],
                "payment_on": invoice["payment_on"],
                "approved": invoice.get("approved"),
            },
        },
        timeout=30,
    )
    result = res.json()
    if not res.ok:
        if result.get("code") == "invalid_state":
            return {"outcome": "needs_facts", "missing": [e["path"] for e in result["errors"]]}
        res.raise_for_status()
    return {
        "outcome": result["answers"]["payment_action"]["choice"],
        "payable_usd": result["answers"]["payable_amount"]["number"],
        "discount_by": result["answers"]["discount_by"]["date"],
        "receipt": result["receipt"],
        "billing": result["billing"],
    }