The Heartland Payment Systems API allows to integrate payments and billing functionalities into web services. Tokens and keys available to authenticate. Also accessible examples in C#, PHP, Java, Ruby, Python, and Node.js. Industries that can benefit from integration include restaurants, education K-12, retail, campus, grocery, parking, laundry, and petroleum. Heartland provides payroll, gift cards, point of sale, mobile payments, school solutions, school nutrition, and mobile ordering services.
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The Heartland PHP Sample Code by Secure Submit demonstrates how to pay for invoice, sign up for recurring payments, and integrate PayPal. Point of sale, master pass, and tokenize available as resources.