When installing the Bronto Connector, the following documentation describes how to create an API Key and set appropriate permissions within your Bronto account:
Here are the key points from that documentation:
The user must be designated as having the “API Access” permission.
Before logging into an account, the account must have the API feature enabled, and must have at least one API token created.
If you have a Professional or Core edition account, you can create and edit API tokens by going to Settings > Platform Settings > Data Exchange in the platform.
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Multi-Brand edition clients, and clients with certain versions of the Agency edition can create and edit tokens able to access all your accounts or a specific account. To create and edit API tokens in a Multi-Brand account, go to Settings > Platform Settings > Data Exchange at the Multi-Brand level.