How to book visits in China with discounts?

I'm 69 years old and heading to China, where most tourist sites are free or discounted for me. However, trip.com either refuses to let me book because the sites are free or doesn’t apply the discount. Does WeChat apply this discount if I book through them? How can I just reserve without paying and pay on-site? Is that possible?

How do I upload my passport to WeChat?

Thanks for your tips. Elisabeth

Hello, We traveled for 3 months in the spring of 2025. We’re over 70 and always paid on-site for visits. We got free entry or a discount by showing our passport. We paid the remaining amounts with Alipay or WeChat. When we arrived in China, Alipay wasn’t working. We asked the staff at the front desk of our first hotel to finish the setup, and they did it without any issues. Have a great trip! Didier