On my website I am selling digital goods and I wish to provide a link and key to a customer after their purchase. I was wondering how I would be able to do this as well as change and edit the stock. 

If you take a look at our guide here, this shows how you can use the commerce system (See the commerce section on the left of the guides)

With regards to those specific items, it would depend on where the key is coming from. You can generate a key by selecting that option within the product benefits section, when setting up a new product

With regard stock, this is done in the "Stock & Price Adjustments" tab.

What if I wish to provide my own key instead of one generated from the API after purchase.

  On 6/9/2022 at 3:58 PM, L3gend said:

What if I wish to provide my own key instead of one generated from the API after purchase.

I'm afraid, there is not a facility for that in the software to provide pre-generated keys that our software did not create.

The following third party add-on looks to facilitate something similar but please reach out to the author to confirm before purchasing:

 

You can sell predefined keys with my app without problems. 🙂