Tell me where I can donate

You have brought me to the brink of crying.

I have been looking for so long, for this sollution.
I have tried exporting and importing to both sites, but it is horrible.
I have bought some plugins which didn’t do what they promised.
I have thought about an expensive $99 plugin, but it’s only function is exactly what this plugin does right now and that’s just too pricey, especially when we are thinking of swapping to Magento in the near future.
I have even tried to make something like this myself in PHP, but I am too much of a novice and I don’t have the time to learn about the WOO REST API.

So my 2nd webshop was just dying off and I even had to cancel some orders due to cross platform stock issues. This.. This is a magnificant effort and I applaud you.
Please give me your Paypal account and I will donate you something, because you my dear developer deserve it!