What is the best way to get access to a sandbox or API for developing integration with Eloqua?
Thank you for reaching out to the community forum with your question.
You will want to reach out to your CSM to get a linked sandbox provisioned for your instance.
You don't need a specific role to use rest API, you can use the credentials of any user in Eloqua, and you will have access based on the security group the user has in Eloqua.
More information about the authentications and Rest API is described in the following document: https://docs.oracle.com/en/cloud/saas/marketing/eloqua-rest-api/Authentication.html
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Sachin Jain | CX Community Manager