It seems that the process of sending and receiving tokens is slow in the process of receiving data through the API provided by simplybook and distributing the data to our url1.
First of all you should not get token each request, instead you should reuse token.
Please provide RAW http requests and responses with execution time for further investigation.
unfortunately we do not have servers in Korea to check this. Please provide ping and traceroute results to user-api.simplybook.asia (you should use this endpoint)