The TradeKing Ruby Sample Code by TradeKing demonstrates API interaction. It provides code to authenticate, set up OAuth, update token, and make a request to the API endpoint. A JSON response is the result of the code flow.
TrueLayer has introduced a PSD2-compliant Payments API. The API enables transfer of funds directly from bank account to bank account. It uses active authentication for the highest possible security, and transferred funds are received instantly. The API is currently in beta testing.
Twitter photo sharing service TweetPhoto is encouraging developers to use its platform by giving them a way to earn some money. The service pays developers by the number of photos that its users upload via the TweetPhoto API.