Before you begin, if you have changed the API Manager's default user and role, make sure you do the following changes:
Log in to APIM admin console (
https://<Server Host>:9443/carbon) and select Browse under Resources.
/_system/governance/apimgt/applicationdata/workflow-extensions.xmlresource, disable the Simple Workflow Executor and enable WS Workflow Executor. Also specify the service endpoint where the workflow engine is hosted and the credentials required to access the said service via basic authentication (i.e., username/password based authentication).
Code Block language html/xml
<WorkFlowExtensions> ... <SubscriptionCreation executor="org.wso2.carbon.apimgt.impl.workflow.SubscriptionCreationWSWorkflowExecutor"> <Property name="serviceEndpoint">http://localhost:9765/services/SubscriptionApprovalWorkFlowProcess/</Property> <Property name="username">admin</Property> <Property name="password">admin</Property> <Property name="callbackURL">https://localhost:8243/services/WorkflowCallbackService</Property> </SubscriptionCreation> ... </WorkFlowExtensions>
Note that all workflow process services of the BPS run on port 9765 because you changed its default port (9763) with an offset of 2.
The application creation WS Workflow Executor is now engaged.
- Go to the API Store Web interface and subscribe to an API.
It invokes the API subscription process and creates a Human Task instance that holds the execution of the BPEL until some action is performed on it.
Note the message that appears if the BPEL is invoked correctly, saying that the request is successfully submitted.
Log in to the Admin Dashboard Web application (
https://<Server Host>:9443/admin-dashboard), list all the tasks for API subscription and approve the task. It resumes the BPEL process and completes the API subscription.
Go back to the API Store and see that the user is now subscribed to the API.
Whenever a user tries to subscribe to an API, a request of the following format is sent to the workflow endpoint:
Code Block language html/xml
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"xmlns:wor="http://workflow.subscription.apimgt.carbon.wso2.org"> <soapenv:Header/> <soapenv:Body> <wor:createSubscription> <wor:apiName>sampleAPI</wor:apiName> <wor:apiVersion>1.0.0</wor:apiVersion> <wor:apiContext>/sample</wor:apiContext> <wor:apiProvider>admin</wor:apiProvider> <wor:subscriber>subscriber1</wor:subscriber> <wor:applicationName>application1</wor:applicationName> <wor:tierName>gold</wor:tierName> <wor:workflowExternalRef></wor:workflowExternalRef> <wor:callBackURL>?</wor:callBackURL> </wor:createSubscription> </soapenv:Body> </soapenv:Envelope>
Elements of the above configuration are described below:
Name of the API to which subscription is requested.
Version of the API the user subscribes to.
Context in which the requested API is to be accessed.
Provider of the API.
Name of the user requesting subscription.
Name of the application through which the user subscribes to the API.
Throttling tiers specified for the application.
The unique reference against which a workflow is tracked. This needs to be sent back from the workflow engine to the API Manager at the time of workflow completion.
The URL to which the Workflow completion request is sent to by the workflow engine, at the time of workflow completion. This property is configured under the
callBackURLproperty in the