Subscription service helps to work on subscriptions and consents in the Epsilon system.
The entrance application is cdd-mule4-subscription-service. It transforms all needed data and sends it towards p-middleware-message-router. Depending on the account source and configuration it routes to different apps to process subscribe/unsubscribe data in Epsilon.
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With more research into this topic, it seems that the subscription service from this application does not work anymore. I could not find any working data with the subscription process.