The small dev company that I work for has been contracted to build an app for client. This client is using Apple Business Manager and wants us to publish to it.

I have built the app and deployed it for review to the Apple Connect. It passed and I see it is now in the client's Apple Business Manager account.

Here is where I am confused. Our client DOES NOT have a MDM. How can I use Apple Business Manager in this case?

Initially I thought I could simply use redemption codes, but now I see that this is not going to work, as redemption codes are similar to "gift cards" that we give out to people. Unless I am mistaken, there is no way to manage them and revoke them when we need so.

It seems that the only way to manage the licenses is to implement a MDM (like Mobile Iron, etc.), but this seems like a lot of work. There must be another way. What about contractors that require a corporate app? Surely, there has to be a way to use the Managed Licensing aspect of ABM without using a MDM.

How can use ABM to do "managed licensing" without our client(s) having a MDM. Is there a way that I can revoke a redemption code once I have issued it?