import json

customer_id = params_kw.get('customer_id', '')
order_id = params_kw.get('order_id', '')
voucher_ids = params_kw.get('voucher_ids', [])
if isinstance(voucher_ids, str):
    voucher_ids = json.loads(voucher_ids)

context = {
    'request_amount': params_kw.get('request_amount', 0),
    'product_type': params_kw.get('product_type', ''),
    'product_name': params_kw.get('product_name', ''),
    'user_level': params_kw.get('user_level', 0),
}

result = await apply_voucher_api(customer_id, order_id, voucher_ids, context)
return json.dumps(result)