File new invoices in Drive and tell finance in Slack

import base64, json
from clickruntime import on_trigger, credentials, http, state, notify

FOLDER_ID = "your-invoices-folder-id"
G = "https://gmail.googleapis.com/gmail/v1/users/me"
UPLOAD = "https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart&fields=id,webViewLink"

@on_trigger
def run(event):
    h = {"Authorization": f"Bearer {credentials.connection('google', 'work')}"}
    seen = set(state.get("seen") or [])
    msgs = http.get(f"{G}/messages", headers=h, params={"q": "has:attachment filename:pdf (invoice OR bill) newer_than:2d"}).json().get("messages", [])
    saved = []
    for m in [m for m in msgs if m["id"] not in seen]:
        msg = http.get(f"{G}/messages/{m['id']}", headers=h).json()
        for part in msg["payload"].get("parts", []):
            if part.get("filename", "").lower().endswith(".pdf"):
                data = http.get(f"{G}/messages/{m['id']}/attachments/{part['body']['attachmentId']}", headers=h).json()["data"]
                meta = json.dumps({"name": part["filename"], "parents": [FOLDER_ID]})
                f = http.post(UPLOAD, headers=h, files={"metadata": (None, meta, "application/json"),
                              "file": (part["filename"], base64.urlsafe_b64decode(data), "application/pdf")}).json()
                saved.append(f"• <{f['webViewLink']}|{part['filename']}>")
        seen.add(m["id"])
    if saved:
        notify.slack("New invoices filed in Drive:\n" + "\n".join(saved), channel="#finance")
    state.set("seen", list(seen)[-500:])
    return {"saved": len(saved)}