Implementation of the CredentialsInterface that allows client code to pass in their credentials in the constructor.
Credentials providers are functions that accept no arguments and return an instance that implements DTS\eBaySDK\Credentials\CredentialsInterface. If they are unable to provide the credentials an instance of \InvalidArgumentException must be returned. The function can supply a message via the returned exception object to explain why no credentials are available.
|CredentialsInterface||Provides access to the API credentials used for accessing the eBay services.|