The official document does not clearly state that the service provider must activate the payment e-commerce downpayment pass in order to combine orders for payment.
However, after initiating combined order payment, an error occurs {"code":"NO_AUTH","message":"The service provider's merchant account has not been authorized to accept this product"}
I called WeChat customer service, and the answer from the customer service was that ordinary service provider merchant accounts do not have payment functions, and a brand new service provider is needed. If there are no sub-merchants, you need to open the e-commerce payment service. If the service provider already has sub-merchants, you need to re-open it. Apply to become a service provider and then open an e-commerce down payment pass