如何为go中的接口构造数据类型转换？

I have a situation where I need to interact with a bunch of API's that all have similar purposes but different data structures returned. I need to operate the same way on data from all the API's but I then also need to maybe send that data back to the API at a later time so it can perform further operations on it.

type API1Response struct {
    Time time.Time
    Price int64
    Status int
    ID string
}

type API2Response struct {
    Price float64
    Status string
    ID int64
}

// and more API responsed that have irreconcilable differences in their structures

both APIs have similar methods, like Buy and Sell and CancelOrder so I thought I could use interfaces to make my calls to the methods more usable but then I will have to make the methods return interface{} instead of returning their specific API response...

now imagine the situation where I want to Buy and I get API1Response. So I call the method defined in my interface but then I want to CancelOrder which needs me to send API1Response back to the API. How can I convert the interface back to API1Response properly?

the only way I could think to do it would be to make a long switch case that tries to convert to every possible data type but IDK if that is idiomatic or error prone in the long run...

if t, ok := emptyInterface.(API1Response); ok {
    //do stuff
} else if t, ok := emptyInterface.(API2Response); ok {
    // do stuff
}

How would you go about solving this problem idiomatically in go?