To create a Facebook app that will post a birthday wish on your friends' profiles on their birthdays, you will need to use the Facebook API. This API allows developers to access certain features of the Facebook platform, such as reading and writing to user profiles, posting to timelines, and accessing friend lists.


Here is a basic outline of how you can use the Facebook API to create a birthday wish app:


First, you will need to create a Facebook app by visiting the Facebook for Developers website and following the steps to create a new app. You will need to provide a name for your app and select a category (such as "Social").


Once your app is created, you will need to obtain an app access token. This token will be used to authenticate your app and grant it access to the Facebook API. To obtain an app access token, you will need to make a request to the Facebook API using your app's ID and secret.


Next, you will need to use the Facebook API to access your friends' profiles and retrieve their birthdays. You can do this by making a request to the /me/friends endpoint of the API, which will return a list of your friends and their basic information. From this list, you can filter out the friends who have their birthdays on the current day.


Once you have a list of friends with birthdays on the current day, you can use the Facebook API to post a birthday wish to each of their profiles. To do this, you will need to make a request to the /{friend-id}/feed endpoint of the API, where {friend-id} is the ID of the friend you want to post to. In the request body, you can include the text of your birthday wish, as well as any other information you want to include in the post (such as a link or an image).


Finally, you will need to set up a schedule for your app to run on a regular basis (such as once per day) in order to check for birthdays and post birthday wishes. You can use a service such as Cron to schedule your app to run automatically.


I hope this helps! Keep in mind that this is just a high-level overview of how you can use the Facebook API to create a birthday wish app, and there are many details and considerations that I have not covered here. If you want to learn more, I recommend checking out the Facebook API documentation and the Facebook for Developers website, where you can find detailed information and examples of how to use the API.

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