Does Pure Land Buddhism only acknowledge the 3 sutra in its canon?

On [this](https://tricycle.org/beginners/decks/pure-land/?continue=1) website, it is stated: > The Pure Land tradition is founded on **three sutras** and two commentaries: **the Sutra on Immeasurable Life**, also known as the Larger Pure Land Sutra; **the Amida Sutra**, also known as the Smaller Pure Land Sutra; and **the Contemplation Sutra**. The two commentaries are Vasubandhu’s Treatise on the Sutra of Immeasurable Life and Shandao’s Commentary on the Contemplation Sutra. Assuming someone acknowledges the Āgama and its form of the Pali canon, are the 3 sutras the only sutras that are, let's say "mandatory" for Pure Land Buddhism, while the rest of the Mahayana sutras are optional? Or are other sutras held as canonical and also "mandatory" to acknowledge and believe in?