PayPal, along with other companies, responds poorly to discovery of security flaws. Duo Security offers an API for its two-factor identification service.
Paypal APIs (13)
PayPal Button Manager
||The PayPal Button Manager API allows developers to create, manage, and edit a large number of PayPal Payments Standard buttons without having to touch HTML code. This API is available for both NVP...||Payments||04.10.2017|
PayPal Billing Plans
||The PayPal Billing Plans API allows creating subscriptions and recurring payments for goods and services. It is available in REST architecture with JSON callbacks. With Billing Plans, developers can...||Billing||03.29.2017|
PayPal Billing Agreements
||The PayPal Billing Agreements API retrieves data related to an agreement. It can create an agreement, update an agreement, show agreement details, and cancel agreements. It is available with REST...||Billing||03.29.2017|
PayPal Express Checkout
||The PayPal Express Checkout API allows merchants to streamline the checkout process. When customers check out, they are redirected to Paypal.com from the merchant's site and then returned to the...||Payments||11.23.2015|
||PayPal is an e-commerce based business that lets users to make and transfer payments electronically. The PayPal Merchant API lets developers integrate its merchant features and functionality with...||Payments||12.03.2014|
To help developers increase the security of their apps, PayPal has updated its developer portal to include a self-service credential provisioning feature that allows developers to generate their own client-secret pairs, which developers use to authenticate their apps with the PayPal API.