// Setting credential. See example for supported credential types and how to set the at:
// https://pkg.go.dev/github.com/Azure/azure-sdk-for-go/sdk/azidentity#readme-credential-types.
// This is useful when the same credentials should be used through the entire application,
// the default is that the module uses it's own instance and set of credentials.
cred, err := azidentity.<FunctionForCredentialType>
if err != nil {
    // Handle error.
}

// Set the Key Vault client credential:
azcfg.SetCredential(cred)
// Setting Key Vault name:
azcfg.SetVault("vault-name")
// Setting Key Vault client concurrent calls (defaults to 10):
azcfg.SetConcurrency(20)
// Setting Key Vault client timeout for the total amount of requests (default to 10 seconds):
azcfg.SetTimeout(time.Millsecond * 1000 * 20)
// Setting the entire client options:
azcfg.SetClientOptions(&azcfg.ClientOptions{
    Credential: cred,       // Defaults to nil, the built-in credential auth.
    Vault: "vault-name",    // Defaults to "", which will check environment variables.
    Concurrency: 20,        // Defaults to 10.
    Timeout: duration,      // Defaults to time.Millisecond * 1000 * 10 (10 seconds)
})
// Setting an external client for Azure Key Vault. Provided client must implement
// KeyVaultClient. Useful for stubbing dependencies when testing applications
// using this library.
azcfg.SetExternalClient(client)

package main

type config struct {
    Host string
    Port int
    
    Username string `secret:"username"`
    Password string `secret:"password"`

    Credential credential
}

type credential struct {
    Key int `secret:"key"`
}

func main() {
    cfg := config{}
    if err := azcfg.Parse(&cfg); err != nil {
        // Handle error.
    }

    fmt.Printf("%+v", cfg)
}