# apply_voucher.dspy — 核销代金券（一次性，不找零；并发安全条件 UPDATE）
customer_id = (params_kw.get('customer_id') or '').strip()
if not customer_id:
    customer_id = await get_userorgid() or ''
order_id = (params_kw.get('order_id') or '').strip()
voucher_ids = params_kw.get('voucher_ids') or []
if isinstance(voucher_ids, str):
    try:
        voucher_ids = json.loads(voucher_ids)
    except (ValueError, TypeError):
        voucher_ids = [s.strip() for s in voucher_ids.split(',') if s.strip()]
context = {}
for k in ('product_type', 'product_name'):
    if params_kw.get(k):
        context[k] = params_kw.get(k)
try:
    context['request_amount'] = float(params_kw.get('request_amount') or 0)
except (ValueError, TypeError):
    context['request_amount'] = 0
context['used_by'] = await get_user() or ''
return await apply_voucher_api(customer_id, order_id, voucher_ids, context)