1st line: oraclize callback
2st line: 2st call smart contract callUserAPI method
3st line: oraclize callback
4st line: 1st call smart contract callUserAPI method, it should don't need to pay any ether, because 1st call for free.
5st line: it is created smart contract transaction.
Bad news is, it is very unstable in test chain. Even I paid 1 ether, it always out of gas. it should don't need so many gas, it is just so simple smart contract. I asked the oraclize team, I am waiting for the their reply.
the function is correct, because not always happened "out of gas", I can get correct callback sometime.
alincode
commented
6 years ago 
@todoI build a base function for use Integration call api, and Integration dapp.
Good news is work now, even code still ugly.
https://github.com/alincode/devon4
This is the smart contract information page. https://rinkeby.etherscan.io/address/0x696a92a0d6b36628dc92e32daba92b85df1c5d5c
Bad news is, it is very unstable in test chain. Even I paid 1 ether, it always out of gas. it should don't need so many gas, it is just so simple smart contract. I asked the oraclize team, I am waiting for the their reply.
the function is correct, because not always happened "out of gas", I can get correct callback sometime.