Send a PayPal invoice from your own form or tool

from clickruntime import on_event, credentials, http, notify

API = "https://api-m.paypal.com"

def paypal_headers():
    resp = http.post(f"{API}/v1/oauth2/token", data={"grant_type": "client_credentials"},
                     auth=(credentials.secret("PAYPAL_CLIENT_ID"), credentials.secret("PAYPAL_CLIENT_SECRET")))
    resp.raise_for_status()
    return {"Authorization": f"Bearer {resp.json()['access_token']}"}

@on_event
def handle(event):
    data = event.json or {}
    if not data.get("email") or not data.get("items"):
        return {"created": False, "reason": "email and items are required"}
    headers = {**paypal_headers(), "Prefer": "return=representation"}
    invoice = http.post(f"{API}/v2/invoicing/invoices", headers=headers, json={
        "detail": {"currency_code": "USD", "payment_term": {"term_type": "NET_14"}},
        "primary_recipients": [{"billing_info": {"email_address": data["email"]}}],
        "items": [{"name": i["name"], "quantity": str(i.get("quantity", 1)),
                   "unit_amount": {"currency_code": "USD", "value": f"{float(i['price']):.2f}"}}
                  for i in data["items"]]})
    invoice.raise_for_status()
    inv = invoice.json()
    http.post(f"{API}/v2/invoicing/invoices/{inv['id']}/send", headers=headers,
              json={"send_to_invoicer": True}).raise_for_status()
    notify.slack(f"🧾 Invoice {inv['detail']['invoice_number']} sent to {data['email']}: "
                 f"USD {inv['amount']['value']}, due in 14 days", channel="#billing")
    return {"invoice": inv["id"]}