ActiveCampaign is a cloud-based marketing automation platform that enhances various marketing, sales, and customer experience processes, and by integrating it with internal applications or products, users can maximize its value. To initiate this integration, users must procure their unique API key by logging into their ActiveCampaign account, navigating to settings, and accessing the Developer section where the API key is displayed. ActiveCampaign offers four pricing tiers, catering to different user needs, from solopreneurs to large organizations, each with varying features and user allowances. The platform has an API rate limit of five requests per second per account, with custom rate limit solutions available. Common errors encountered include issues with account payments and authentication, among others. Additionally, Merge offers a Unified API that facilitates integration with multiple CRM solutions, streamlining processes for users who also employ other marketing automation tools like Hubspot and Klaviyo.