A few technical questions

New Member
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Hi everyone.
What tools can I use to create custom products with their own characteristics?
How do I keep track of the rest of this product in different stores?
How do I make it so that when buying this product in different stores, the commission is removed in favor of me? Is it possible to do this? How to issue this product for free for the purchase of other products as a marketing promotion? Need to create your own app?