Developing your APIs and applications
You develop APIs by using the IBM® API Connect developer toolkit.
The API Connect developer toolkit provides both the API Designer user interface and a command line interface that you can use to develop APIs and publish them to API Connect.
Security tip: While developing your API, remember to protect sensitive
data that might be exposed to consuming applications. For information on configuring security
requirements for your APIs, see Enforcing security requirements on an API.
You publish APIs by including them in a "product" and then publishing that product. Define your APIs and products by creating and validating YAML definition files in your local file system, or using the API Connect UI. You can then interact with API Connect using either the UI or the toolkit commands.
Note: In the 
Help page of the Cloud Manager,
API
Manager, and API Designer user interfaces,
there's a Product information tile that you can click to find out information
about your product versions, as well as Git information about the package versions being used. Note
that the API Designer product
information is based on its associated management server, but the Git information is based on where
it was downloaded from.
Help page of the Cloud Manager,
API
Manager, and API Designer user interfaces,
there's a Product information tile that you can click to find out information
about your product versions, as well as Git information about the package versions being used. Note
that the API Designer product
information is based on its associated management server, but the Git information is based on where
it was downloaded from.The developer toolkit is described in detail in the following subsections: