tixastronauta

Receiving Facebook Leads on a Webhook

2020 IMPORTANT UPDATE - READ THIS BEFORE CONTINUING

THis gist was created in 2016 and I haven't been working with Facebook Leads ever since. As a result, this guide might not be accurate.

Please check @eladnava's updated step-by-step guide for 2020 here: https://eladnava.com/get-facebook-ad-lead-notifications-in-realtime-with-node-js-webhooks/

rrag

There are many tutorials and articles available online which explain functional programming. Examples show small functions, which are composed into others which again get composed. It is hard to imagine how it would all work, then come the analogies and then the math. While the math is necessary to understand it can be difficult to grasp initially. The analogies on the other hand, (at least for me) are not relatable. Some articles assume the reader knows the different terminologies of FP. Over all I felt it is not inviting to learn.

This introduction is for those who have had a tough time understanding those analogies, taken the plunge to functional programming but still have not been able to swim. This is yet another tutorial on functional programming

Terminology

Functions as first class citizens

Functions are first class means they are just like anyone else, or rather they are not special, they behave the same as say primitives or strings or objects.

burgalon

public class AccountAuthenticator extends AbstractAccountAuthenticator {

  private final Context context;
  @Inject @ClientId String clientId;
  @Inject @ClientSecret String clientSecret;
  @Inject ApiService apiService;

  public AccountAuthenticator(Context context) {
    super(context);