prompt:
Exclusion of ideas:
1. The user's mobile phone problem (IOS, Android) system.
2. Alipay app version of the problem.
3. Alipay interfaces change.
4. Product app in the sdk version is too low, Alipay not supported.
5. backend service interface problems.
6. missed payment interface parameters 7. Repeat order number.
8. did not deal with the payment amount, such as exceeding 2 decimal places, as shown in FIG.
