https://www.reuters.com/article/us-walmart-mexico/walmart-in-mexico-launches-grocery-orders-via-whatsapp-idUSKCN1TP2R6 >Walmart's Mexico unit has begun offering grocery delivery from its Superama stores via messaging service WhatsApp, the retailer said on Monday, in a new stab at attracting shoppers outside bricks-and-mortar supermarkets.