Golang quirks

I often pass a struct to a function, sometimes the structs contain pointers,

then on initialisation, the question is how to do it in the simplest possible way? 

The definition of transactionType is string

    

    purchaseRequest(&merchant.MerchantPurchaseRequest{

        TransactionType: &"21", // <-- want to do this

    })

// but have to do this

txT := merchant.TransactionType("21")

    purchaseRequest(&merchant.MerchantPurchaseRequest{

        TransactionType: &txT, 

    })

https://golang.org/ref/spec#Address_operators 

https://stackoverflow.com/questions/30716354/how-do-i-do-a-literal-int64-in-go/30716481