@Override
protected void internalInit() {
super.internalInit();
CommonHelper.assertNotBlank("scope", this.scope);
this.service = new PayPalOAuth20ServiceImpl(new PayPalApi20(), new OAuthConfig(this.key, this.secret,
this.callbackUrl,
SignatureType.Header,
this.scope, null),
this.connectTimeout, this.readTimeout, this.proxyHost,
this.proxyPort);