The entire API V2 documentation is interactive and can be tested here. To the right side of every endpoint you will see a box with an example request. You can click on the "Try it" button to send a request to the server right from the docs. You will need to provide an API key by clicking the ApiKeyAuth_token blue text.
https://api.instantly.ai/
https://developer.instantly.ai/_mock/api/v2/
This entity represents a tag being assigned to a specific campaign or email account. When an email account is assigned a tag, a new custom tag mapping entry is created, which connects the tag (tag_id field) with the email account (resource_id field). You can use it to see which tag si connected to which resource.