Dialogflow with External API Laravel

I want to make a chatbot in dialogflow, I have the api in Laravel, if you need to make a modification. I'll do it for you quickly. I have two tables: categories and products, where a product belongs to a category. I would like to consult the chatbot about the categories and when choosing a category (ships in Dialogflow), it tells me what the products and their information are. I have already advanced a part of the project but it does not detect the ships buttons. I can share with you my project, I can do all the code I need the configuration in Dialogflow