Square, the payments app founded by Twitter co-founder Jack Dorsey, is making it easier for app developers to charge customers within their mobile experiences. Today, the company launched its new Square In-App Payments Software Development Kit (SDK), which is available for iOS, Android, and Google’s Flutter framework. The Square In-App Payments SDK lets developers take payments from users using just a few lines of code. It supports traditional credit and debit cards, as well as both Google Pay and Apple Pay. Developers can also use the SDK to allow users to securely save their payment card information, for subsequent transactions.…

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