Looking for AEM Integration with Campaign

[Maheswari]

We are looking to integrate AEM with adobe campaign classic. We are considering two options for this

1. use the cloud service configuration and use the OOTB form components for campaign to subscribe/unsubscribe or create a lead in camapign

2. use Adaptive forms to build these forms

Are there any rest apis available for campaign classic, which we will be able to use for form submission using adaptive forms?

which will be the best approach