PayPalClient(BaseClient _inner, String clientId, String clientSecret, {String apiVersion: "v1", String paypalEndpoint: "https://api.paypal.com"})

Source

PayPalClient(this._inner, this.clientId, this.clientSecret,
    {String this.apiVersion: "v1",
    String this.paypalEndpoint: "https://api.paypal.com"}) {
  this.paypalEndpoint = paypalEndpoint.replaceAll(new RegExp(r"/+$"), "");
}