NewCartEndpoint initialize the Endpoint, setting the envvars inside the struct or its default valuesFor each parameters, its checked if its empty, in case true we use the default value.

CartEndpoint struct that represents the CardEndpoints envvars and Database.

CartRequest struct to Represent each Product Request from the Cart API.

CartRequests struct the reprents a list of Product Request from the Cart API.

CartResponse struct to represent a Response from the Cart API.

ResponseProduct struct to represent the Product inside the response from the Cart API.

Endpoint is the default interface used to configure all the possible handlers that implement the Post method.