How does php use Yunpian.com to realize SMS verification code function?

I charged 2000 text messages and was deducted for no reason. After checking, I found that within a few days, their system frequently sent short messages to an empty number, but they couldn't be received. However, Yunpian.com directly deducted the fee, and if our interface was improperly configured and the SMS balance was insufficient, he reminded us to deduct our fee. Anyway, as long as you use Yunpian.com, no matter whether it is successful or not, you have to charge. Consult customer service. They said that as long as the interface gave them instructions, they would charge. They don't care if the phone is empty. 2,000 were cheated like this. The following is a screenshot