We use Stripe for offering different payment options across the world. It is easy to add to your product, and takes a lot of work out of your hands. They can even calculate taxes for you.
Talespinner uses Mistral Large as a writing model. It is great for writing novels with more mature topics, since it doesn't censor your writing that much.
Talespinner uses OpenRouter to allow for switching between different language models. They make it super easy to do this, because they offer one API format for all language models.
Talespinner uses Claude 3.5 Sonnet as the default writing model. It is great at considering all the context for your book, and is very good at creative writing.