Handwrytten Handwrytten is a service that automates sending handwritten notes. Businesses use it for marketing, customer appreciation, and personalized communication at scale. Official docs: https://www.handwrytten.com/api-handwrytten-developer Handwrytten Overview - Cards - Card Batches - Contacts - Campaigns - Orders - Account - Billing - Payment Methods - Users Use action names and parameters as needed. Working with Handwrytten This skill uses the Membrane CLI to interact with Handwrytten. Membrane handles authentication and credentials refresh automatically — so you can focus on the integ…