Which famous author was paid to create advertisements for Guinness beer in the 1930s, later incorporating elements of these ads into his literary masterpieces?

Throughout literary history, certain products have become intimately associated with famous authors, either through their personal endorsements or their characters' usage. Some of these endorsements were intentional marketing campaigns, while others developed organically through an author's genuine affection for a product. This trivia explores a famous literary-commercial connection that influenced both the author's work and the product's cultural significance.

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James Joyce
Dorothy L. Sayers
F. Scott Fitzgerald
Ernest Hemingway