Scikit-learn - scikit-learn (formerly scikits.learn) is an open source machine learning library for the Python programming language.
PayPal - PayPal is the faster, safer way to pay online without sharing financial details, send and receive money or accept credit and debit cards as a seller
Pandas - Pandas is an open source library providing high-performance, easy-to-use data structures and data analysis tools for the Python.
Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.
NumPy - NumPy is the fundamental package for scientific computing with Python
Braintree - An all-in-one solution to accept, process, and split payments in your mobile app or online - from small business to large enterprise.