To answer a question on the page: "I'm not sure how transferring apps from one Apple ID to another works. We can figure it out though."
I'm fairly sure this is impossible. I know people (with large apps and the right contacts) that have tried, and never heard of it being possible. Unless something changed recently. You could transfer the account (unless other apps are also on it).
The official line on this from Apple in their iTunes Connect FAQs:
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Q: I sold my app to another developer and can no longer distribute it on the App Store. Can I transfer the app to the new developer's iTunes Connect account?
A: No, you can’t transfer the app to another developer account on iTunes Connect. To add the app to another account, remove the app from the current account and upload it to the new iTunes Connect account.
Note that uploading the app to a new iTunes Connect account will disable current customers from receiving automatic and free updates of your application. All customer reviews, rating, and ranking information will be reset. You will not be able to reuse the app name and SKU in the old account. If you have uploaded a binary or used the app with the iAd Network, your Bundle ID will not be reusable either.
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I have no idea if special exceptions are possible, but that is their official policy:
From what I've read you can convert individual developer accounts to company ones and transfer ownership of them with a company sale but you can't split them or transfer apps between accounts. I would be really interested if anyone has experience that is different to this.
Why is this being downvoted? This is true. Talk to people about it, you CAN transfer an app from one account to another. This is why the kindle app is now on amazon's account instead of the company that wrote it.
I am an iOS developer and have been since before there was an official API
I'm fairly sure this is impossible. I know people (with large apps and the right contacts) that have tried, and never heard of it being possible. Unless something changed recently. You could transfer the account (unless other apps are also on it).