Approval system

Hello, I'm in need of integrating an approval workflow into my application. Here's the envisioned flow:

User submits a refund request.
The funds associated with the request are linked to a specific project.
Each project is assigned one or more 'funds responsible.'
Upon request submission, the designated funds responsibles receive an email containing a unique link for approval.
Finally, the supervisor responsible for overseeing all expenses provides the ultimate approval.
I attempted to implement the eightynine-approvals solution, but despite following the provided guide, no action occurs. Furthermore, the approval seems to be directed towards groups of individuals rather than specific users (funds responsibles).

Is it necessary for me to develop my own solution, or is there an existing alternative available?
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