There are several important factors involved in choosing the right mobile card payment machines for your business. First, check the types of payments you need to accept, such as Chip and PIN, contactless or mobile wallets. Next, consider compatibility with your existing systems and ease of integration. Examine the costs including upfront fees, transaction fees and monthly charges. Prioritise security features to ensure secure transactions. Finally, look for a provider that has reliable customer support and supports your business needs, like UTP.