No. It is currently not possible to merge two separate accounts on Paystack. However, you can access both dashboards from one account. To do this, login to the dashboard of any of the businesses (say, business A) and add the login email for business B as a team member; assign an admin role. Here's a step-by-step guide on how to add a user to your Paystack business?.
After adding business B's email as a team member, login to business B's dashboard, and you'll be able to toggle between both businesses. You can do this by clicking on the drop-down arrow at the top left corner of your dashboard, beside your business name, and selecting the particular dashboard you want to view. You can do this for as many businesses as you have on Paystack. See below:
If you have more than one Paystack account and no longer have the need for all except one, you can close any of the businesses you no longer need.
To close a business, please ensure that you are logged in with the main owner email address for the account and visit your dashboard settings page. No team member can close a Paystack business—not even an admin. Only the main owner of a Paystack business can close it.
On the settings page, click the Preferences tab and scroll to the bottom of the page to find the ‘Close this business’ option. Select a reason for the closure of the account and click Close this business.