Just like with the fetching of products, we need to support one action that triggers everything. We need another action for when the HTTP request succeeds and one last action to support error handling:

// product.constants.ts

export const FETCHING_PRODUCTS = "FETCHING_PRODUCTS";
export const FETCHING_PRODUCTS_SUCCESSFULLY = "FETCHING_PRODUCTS_SUCCESSFULLY";
export const FETCHING_PRODUCTS_ERROR = "FETCHING_PRODUCTS_ERROR";
export const ADD_PRODUCT = "ADD_PRODUCT";
export const ADD_PRODUCT_SUCCESSFULLY = "ADD_PRODUCT_SUCCESSFULLY";
export const ADD_PRODUCT_ERROR ="ADD_PRODUCT_ERROR";