PayPal Checkout SDK and Braintree Direct SDKs listed. Checkout is an in-app SDK to smooth the checkout process in PayPal. Braintree works with Android and iOS. It is a recommended way to accept PayPal, credit, or other payment methods.
Stripe brings simplicity interms of making payments in your iOSapp. Stripe is opensource and offers you an API that allows for easy synching payments with the powerful, customizable, UI elements available out-of-the-box to help collect your users' payment details.
RMStore is a lightweight iOSlibrary for In-App purchases. The RMStore library is an all in one option as it adds notifications to the Storekit, receipt verifications for payments, content download and transaction persistence.
Paypal created BrainTree, a payments SDK that integrates PayPal, Venmo, credit and debit cards, and popular digital wallets like Apple Pay and Google Pay. BrainTree has great scalability, fraud protection, and leverage the PayPal network which can streamline any business.
The Braintree SDK offers you the opportunity to integrate Credit Cards, PayPal, Pay with Venmo, Apple Pay, ThreeDSecure, Visa Checkout means of payment into your application. The Braintree library requires Xcode 10+ and a Base SDK of iOS9+. It permits a Deployment Target of iOS8.0 or higher.
Squareup helps you build and grow your business. Square is a online platform that offers you amazing payment services. their services cut across payment assistance, point of sale, capital and payroll all available by simply creating a Square account.