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1. Log in to the API Publisher.
   https://api.cloud.wso2.com/publisher/ 

2. Click Add New API, Design a new API,  and Start creating to create an API with the following information and then click Implement.

   Field		Sample value
   Name		YahooWeather
   Context		/weather
   Version		1.0
   Resources	URL pattern	current/{country}/{zipcode}
   	Request types	GET method to return the current weather conditions of a ZIP code that belongs to a particular country

   

   The Implement tab opens. 

3. Select Managed API, provide the information given in the table below and click Next: Manage >.

   Field	Sample value
   Endpoint type	HTTP/REST endpoint
   Production endpoint	You can find the Yahoo weather API's endpoint from https://developer.yahoo.com/weather/. Copy the part before the '?' sign to get this URL: https://query.yahooapis.com/v1/public/yql To verify the URL, click the Test button next to it.
   Sandbox endpoint	https://query.yahooapis.com/v1/public/yql. To verify the URL, click the Test button next to it.

   

4. Provide the following information in the Manage tab and click Save & Publish once you are done.

   Field	Sample value
   Tier Availability	Gold
   Keep the default values for the other attributes

   

5. Download and install the WSO2 API Manager Tooling Plug-in if you have not done so already. 

6. Open Eclipse.

7. On the Window menu click Perspective, Open Perspective, Other to open the Eclipse perspective selection window. Alternatively, click the Open Perspective icon shown below at the top right corner.
    

8. On the dialog box that appears, click WSO2 API Manager and click OK.
   

9. On the APIM perspective, click the Login icon as shown below.
    

10. On the dialog box that appears, enter the Enter your cloud username (in the format <email@company_name>) and password, and click OK in the dialog box that appears.

    Note
    Make sure that the Connect to WSO2 App Cloud checkbox is not selected.

    

11. On the tree view that appears, expand the folder structure of the existing API.

12. Right-click on the in sequence folder and click Create to create a new in sequence.

    
    
    This is because you want the custom sequence to be invoked in the In direction or the request path.
    If you want it to be involved in the Out or Fault paths, select the respective folder under customsequences.

    Tip
    Tip : If you prefer not to use the registry to upload the sequence or want to engage a sequence to all APIs in the APIM WSO2 API-M at once, you can do so by saving the mediation sequence XML file in the file system. See Adding Mediation Extensions for details.

13. Name the sequence YahooWeatherSequence.

14. Your sequence now appears on the Developer Studio console. From under the Mediators section, drag and drop a Property mediator to your sequence and give the following values to the property mediator.

    Property Name	New Property
    New Property Name	YQL
    Value Type	Expression
    Value Expression	For the XPath expression, we take a part of the query in the Yahoo API's endpoint (https://developer.yahoo.com/weather/) and concatenate the zip code and country to it using the synapse get-property XPath expression: Code Block concat('?q=select%20*%20from%20weather.forecast%20where%20woeid%20in%20(select%20woeid%20from%20geo.places(1)%20where%20text%3D%22',syn:get-property('uri.var.zipcode'),',',syn:get-property('uri.var.country'),'%22)&format=json')

    

15. Similarly, add another property mediator with the following values.
    This is an HTTP transport property that appends its value to the address endpoint URL. Once you are done, save the sequence.

    Property Name	New Property
    New Property Name	REST_URL_POSTFIX
    Value Type	Expression
    Value Expression	get-property('YQL')
    Property Scope	Axis2

    

16. Save On the File menu in Eclipse, click Save to save the sequence.
17. Right-click on the sequence and click Commit File, and thereafter click Yes to push the changes to the Publisher server.
18. Log Sign back in to the WSO2 API Publisher, select search for the API that you created earlier, and click the Edit link right next to its name to go to the edit wizard. 
    

19. Navigate to the API's Implement tab, click Click Implement and Manage API. Thereafter, click the Enable Message Mediation checkbox, and select the sequence that you created for the In flow. Next, Save the API.

    Tip
    Tip : It might take a few minutes for the sequence to be uploaded into the API Publisher. If it isn't there, please check again later.

    

20. Open the API Store, subscribe to the API that you just published and generate the access tokens in order to invoke the API.
    
21. Click the API Console tab of the API. It opens the integrated API Console using which you can invoke the API.
    

22. Give the following values for the parameters and invoke the API. You can also give any other value of your choice.

    country	usa
    zipcode	95004

    

23. Note the response that you get as a JSON object from Yahoo.
    

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