TypeError ClientCredentialsAuthManager::addExpiryTime(): Argument #1 ($oAuthToken) must be of type PaypalServerSdkLib\Models\OAuthToken, array given

[lehnen]

This happens to me, when my credentials are invalid.

In this case PaypalServerSdkLib\Authentication\ClientCredentialsAuthManager::fetchToken does not return an oAuthToken, but an array. So the next step call $this->addExpiryTime($oAuthToken); will fail.

I think there has to be a type check before.