1.- Go to https://developers.facebook.com/ and click on My Apps
2.- Click on the name of your project on Facebook for developers.
3.- Select the Configuration option and click on Basic.
4.- Click on the copy icon in the SHA-1 certificate fingerprint.
5.- Go to https://hash-facebook.apphive.io/ and paste the Fingerprint of the SHA‑1
certificate and click SEND.
6.- Copy the key hash.
7.- Paste the Key Hash in Key Hashes in Facebook for developers, select the key
that appears in the blue box and click Save changes.
8.- Add “YOUR” email in the Contact email section, Paste “YOUR” URL of the
Privacy Policy, select a category, and click on the add icon of the app.
9.- Click on Choose file
10.- Select the icon of your app. It must be a JPG, GIF, or PNG file. The image size
should be between 512 x 512 and 1024 x 1024 pixels. The file size limit is 5 MB.
11.- Click on Save changes.
12.- Click on the Switch of In Development.
13.- Click on Change Mode.
14.- It will change to published mode, click on the + icon in PRODUCTS
15.- Select Log in with Facebook and click Configure.
16.- Select Android
17.- Click Next.
18.- Click Next.
19.- Click on Save.
20.- Click on Save and Continue.
21.- Activate the Switch to Yes, click Save and click the Next button.
22.- Click Next.
23.- Click Next.
24.- Click Next.
25.- Click Next.
26.- Click on Settings
27.- Click on Authentication in your Firebase project.
28.- Click on Sign-in method and click on Facebook.
29.- Click on the Copy icon.
30.- Paste in Valid OAuth redirect URIs, select the option in the blue box and click
Save