[Suggestion] Allow other Authentication Flows e.g. RefreshToken Flow

[papoms]

Hey there and thanks a lot for the package!

The underlying php-sdk-2.1 allows for three different authentication flows:

• grantToken
• refreshToken
• accessToken

I only had access to credentials allowing the refreshToken Flow so i wanted to use that. How do you feel about making the authentication flow a configuration option in this package?

[upsmod]

fixed #15

[upsmod]

@papoms @aemaddin you can close that - thank you