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Create and Publish an API

API creation is the process of linking an existing backend API implementation to the API Publisher so that you can manage and monitor the API's lifecycle, documentation, security, community, and subscriptions. Alternatively, you can provide the API implementation in-line in the API Publisher itself.

In this tutorial , you create an API using a production endpoint and publish it to the API Store.

Let's get started.

1. If you have not registered to the API Cloud yet, go to https://cloud.wso2.com/ and sign up.
2. Sign in to WSO2 API Cloud and the API Publisher web application will open automatically.
3. Close the interactive tutorial that starts automatically if you are a first-time user, and then click ADD NEW API.
   
4. Select Design a New REST API and click Start Creating.
   

5. Specify the following as the API details and click Add to add the resource.

   Field	Sample value
   Name	PhoneVerification
   Context	/phoneverify Tip : You can define the API's version as a parameter of its context by adding the version into the context. For example, <{version}/phoneverify. The API Manager assigns the actual version of the API to the version parameter internally. For example, https://gateway.api.cloud.wso2.com:8243/t/companyn/1.0.0/phoneverify . Note that the version appears before the context, allowing you to group your APIs based on versions.
   Version	1.0.0
   Visibility	Public
   Resources	URL Pattern: CheckPhoneNumber Request Types: GET, POST

6. After you add the resource, click its GET method to expand it and then provide the following parameter details:

   Parameter Name	Description	Parameter Type	Data Type	Required
   PhoneNumber	Give the phone number to be validated	Query	String	True
   LicenseKey	Give the license key as 0 for testing purpose	Query	String	True

   Once done, click Implement. Alternatively, click Save to save all the changes made to the API. You can come back later to edit it further by selecting the API and clicking on Edit.

7. Click the Managed API option.

8. The Implement tab opens. Specify the information given in the table below:

   Field	Sample value
   Endpoint type	HTTP/REST Endpoint
   Production endpoint	This sample service has two operations as CheckPhoneNumber and CheckPhoneNumbers . Let's use CheckPhoneNumber here. http://ws.cdyne.com/phoneverify/phoneverify.asmx To verify the URL, click the Test button next to it.

9. Click Manage to go to the Manage tab and enter the information in the table below:

   Field	Sample value	Description
   Tier Availability	Select all	The API can be available at different levels of service. They allow you to limit the number of successful hits to an API during a given period of time.

10. Click Save & Publish . This will publish the API to the API Store. so that subscribers can use it.

Now you have successfully created and published an API.

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