I found Zanbus from Baidu to go to Mutianyu part of the Great Wall . You need to have WeChat Pay or Alipay to buy tickets from their website. Or go to Citrp website to buy tickets with credit card, which was the only inconvenience for foreigners.
Zanbus’s helpline was very easy to reach, and very helpful. We found the whole experience was very organised, and the cost of the bus trip and the entrance fees combos were good value.
There were 4 or 5 buses on that day, the buses were clean and tidy with seatbelts.
Zanbus staff were all very thorough and friendly, some of them were learning to speak English.
We enjoyed the walk on the Great Wall, Zanbus made the trip very easy and enjoyable.