The PayPal Invoicing PHP SDK by PayPal allows developers to integrate the PayPal Invoicing API into their PHP projects and applications. This SDK requires PHP 5.2 or greater and the curl/openssl PHP extensions.
Escrow.com has announced a beta version of its Platform API. Through the API, third party apps and services can integrate the escrow services Escrow.com has long been known for. Once integrated, apps and services can hold money in trust until a transaction has fully completed.
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.