How can I create Twitter application?

To create a twitter application, go to https://apps.twitter.com/

Note : From July 2018, we need to apply for a developer account to create the twitter app.

Step 1: Apply for a developer account

For this please click on the “Apply for the developer account” and continue the process.

If you are a new developer, you can visit the link directly for creating the developer account.

https://developer.twitter.com/en/apply/user

Step 2:

Select the twitter account and click on Continue.

Step 3 :

Add your account details.

Here select the purpose, account name, country and click on continue.

Step 4 :

Describe the project.

Here describe the purpose and select the option and click on continue.

A sample description is given below.

I am using a WordPress plugin to publish posts automatically from blog to Twitter. 
The plugin requires Twitter App to publish posts from WordPress to Twitter. 
For this I must create an app and provide the app details such as API key,API secret,Access token and Access token secret.’
When a new post,custom post type or page is created at my WordPress site,it contains title,content,excerpt,images/videos etc. When clicking the ‘publish’ button on the right side of the post/page/custom post type. 
The new post/page/custom-post-type will be published on the website as well as on Twitter.
The plugin allows to pre fill the tweet content by allowing tweet formats such as POST_TITLE ,PERMALINK etc,which will be replaced by the blog post’s contents and also it attach image/video to the tweet as per settings.

Step 5 :

Accept terms and conditions and submit the application.

Step 6 :

Do the email verification.

Step 7 :

If you are already using an app, please edit each of the apps and add a description of the app’s use.

Else go to Step 10.

Step 8 :

Click on the details button to add the details.

Step 9 :

You can enter the details and save it.

Step 10 :

Once the developer account gets approved, you will get a mail from twitter. Then you can create a new app.

Step 11 :

Now in the developer welcome page we can select the create new app option.

Step 12 :

In the create app section we can add the App Name (It is name of the App), Application description, website url, and tell how the app is used. A sample description is given below.

I am using a WordPress plugin to publish posts automatically from blog to Twitter as a simple text message or or as text message with image/video. 
The plugin requires Twitter App to publish posts from WordPress to Twitter. 
For this i must create an app and provide the app details such as API key,API secret,Access token and Access token secret.

After entering the details, click on the “Create” button.

Step 13 :

Review the terms and create the app.

Step 14 :

Now go to the “Keys and tokens” section.

Step 15 :

Click on the “Create” button under “Access token & access token secret” section.

Step 16 :

Now you will get the consumer API keys and Access token keys with secret keys.

Please use these keys in the plugin twitter settings section.

Step 17 :

Normally the permission of the app is “Read and Write”. If the permission is “Read only”, please edit the permission and make it “Read and Write”.

That’s it ! The app is now ready to use.