Next-gen API v1.4

600 Campaign Blueprints and new search functionalities in this release

• Blueprints! You now have access to more than 600 Campaign Blueprints to use as a starting point for your next email campaign.
  Access API documentation for Campaign Blueprints

Plus, a few more features and changes:

• Apply tags to Templates for easy categorization API documentation for Campaign Blueprints
• Search Templates by name and tags API documentation for Templates
• Search Transaction Email logs by email API documentation for logs Transactional Email
• Usage of "-,_" characters in Custom Attributes name is now allowed API documentation for Account Custom Attributes
  Finally, some minor bug fixes and invisible changes:
• Rate limiting on key endpoints, protecting the API and the sending reputation of your account. On infrequent circumstances, the API can now return HTTP 429