SumUp SumUp is a financial technology company that provides payment solutions. It's primarily used by small businesses and merchants to accept card payments in-store or online. Official docs: https://developer.sumup.com/ SumUp Overview - Payment - Transaction - Payout - Refund - Merchant Profile Working with SumUp This skill uses the Membrane CLI to interact with SumUp. Membrane handles authentication and credentials refresh automatically — so you can focus on the integration logic rather than auth plumbing. Install the CLI Install the Membrane CLI so you can run from the terminal: Authentica…