How to call API with Bearer token Wso2 EI? - oauth-2.0

Question

I have 2 api to request:
API get token
API request to work something (use OAuth2)
Below is code to call get token:
<?xml version="1.0" encoding="UTF-8"?>
<api context="/default" name="PostToken" xmlns="http://ws.apache.org/ns/synapse">
<resource methods="GET">
<inSequence>
<payloadFactory description="Setting payload for GetAccessToken API" media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
<root xmlns="">
<grant_type>$1</grant_type>
</root>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args>
<arg value="client_credentials"/>
</args>
</payloadFactory>
<!-- Below configurations are required to send data as application/x-www-form-urlencoded -->
<header name="Content-Type" scope="transport" value="application/x-www-form-urlencoded"/>
<property name="messageType" scope="axis2" type="STRING" value="application/x-www-form-urlencoded"/>
<header name="Authorization" scope="transport" value="Basic xxxxxxxx"/>
<property name="POST_TO_URI" scope="axis2" type="STRING" value="true"/>
<call>
<endpoint>
<http method="post" uri-template="https://sample.com/token">
<suspendOnFailure>
<initialDuration>-1</initialDuration>
<progressionFactor>-1</progressionFactor>
<maximumDuration>0</maximumDuration>
</suspendOnFailure>
<markForSuspension>
<retriesBeforeSuspension>0</retriesBeforeSuspension>
</markForSuspension>
</http>
</endpoint>
</call>
<respond/>
</inSequence>
<outSequence/>
<faultSequence/>
</resource>
</api>
How next step I can get token from response to apply the 2nd API with Bearer token?
Many thanks!

Answer 1

You can refer to the following blog regarding the Using OAuth2 Protected Back-ends With API Manager., This blog is regarding handling that in the WSO2 API Manager. But this is applicable in the EI as well.
[1] https://medium.com/#menakajayawardena/wso2-how-to-using-oauth2-protected-back-ends-with-api-manager-5d7e234c61c