Hi Miguel Angel F.,
I'm a bookseller and I would like to create a very simple system in PHP using any framework of your preference for inventory management. The system is to integrate with Amazon and other marketplaces that sell used books. So far I have to register the books that I want to sell individually on each marketplace. The system will integrate the marketplaces API's, I will register the book in the system, and the system will register via API in the marketplaces automatically. The system will also activate and deactivate the advertisements as soon as a book is sold in any of the marketplaces to avoid duplicate sell. Please find attached the description of the system and give me a quote.