The products in your Gumroad or WooCommerce shops are only buyable "containers". They do not contain the downloadable artifacts a customer can access. All downloadable artifacts are managed by the ninkik only.
In ninkik navigate to Marketplace > Assign products. You'll find an overview of all connected products.
Click on the button Link new product.
|Marketplace||Select a marketplace you have already connected|
|Marketplace product||You get a list of all products you have available in the selected marketplace|
|ninkik product||The list contains all ninkik products which have not already been assigned to the previous selected Marketplace product|
|Include subproducts||If you check this box and the selected ninkik product has sub products, the customer buying the product in Gumroad or WooCommerce has automatically access to all sub products|
|Default access policy||Select to which releases the customer has access to|
After you have created the new link, you'll see an URL named Redirect URL. In Gumroad, navigate to Products > Content and click on Redirect to URL after purchase. Copy the Redirect URL in there. As soon as your customer buys this product, she will be redirected to ninkik and gains access to the releases.
At the moment there is no Gumroad API available to automate this.