Draft a Xero invoice for each won deal and approve it in Slack

import json
from urllib.parse import parse_qs
from slack_sdk import WebClient
from clickruntime import on_event, credentials, http
XERO = "https://api.xero.com/api.xro/2.0"
TENANT = "your-xero-tenant-id"

def xero(method, path, **kw):
    r = http.request(method, XERO + path, **kw, headers={"Accept": "application/json", "Xero-tenant-id": TENANT, "Authorization": "Bearer " + credentials.connection("xero", "company")})
    return r.raise_for_status() or r.json()

@on_event
def handle(event):
    if (event.header("content-type") or "").startswith("application/x-www-form-urlencoded"):
        p = json.loads(parse_qs(event.body)["payload"][0])
        inv_id = p["actions"][0]["value"]
        inv = xero("POST", f"/Invoices/{inv_id}", json={"Invoices": [{"InvoiceID": inv_id, "Status": "AUTHORISED"}]})["Invoices"][0]
        WebClient(token=credentials.connection("slack", "work")).chat_update(channel=p["channel"]["id"], ts=p["message"]["ts"], blocks=[],
            text=f"{inv['InvoiceNumber']} for {inv['Contact']['Name']} approved by <@{p['user']['id']}>")
        return {"approved": inv["InvoiceNumber"]}
    deal = event.json
    inv = xero("PUT", "/Invoices", json={"Invoices": [{"Type": "ACCREC", "Status": "DRAFT", "Contact": {"Name": deal["name"], "EmailAddress": deal.get("email")},
               "LineItems": [{"Description": i["name"], "Quantity": i.get("qty", 1), "UnitAmount": i["price"], "AccountCode": "200"} for i in deal["items"]]}]})["Invoices"][0]
    text = f"Draft {inv['InvoiceNumber']} for {deal['name']}: {inv['Total']:,.2f}"
    WebClient(token=credentials.connection("slack", "work")).chat_postMessage(channel="#finance", text=text, blocks=[
        {"type": "section", "text": {"type": "mrkdwn", "text": text}},
        {"type": "actions", "elements": [{"type": "button", "text": {"type": "plain_text", "text": "Approve"}, "style": "primary", "value": inv["InvoiceID"]}]}])
    return {"draft": inv["InvoiceNumber"]}