This API point doesn’t return the payment method names, this is required for configuring all payment method customizations, this causes many problems because there’s often a big difference between the payment method name the merchant sees and what Shopify uses in the background.
For example:
“Mercado Pago Cuotas sin Tarjeta”
Becomes “Cuotas sin Tarjeta con Mercado Pago” and other bizarre changes.
I have another thread here that I stopped updating because at this point knowing the real payment method name became a competitive advantage for our apps: