Final answer:
The answer is False. Custom payment applications endorsed by the PCI SSC are not automatically subject to PA-DSS requirements. However, they must still meet certain security requirements.
Step-by-step explanation:
The answer to the question is False. The PA-DSS, which stands for Payment Application Data Security Standard, is a set of security requirements specifically designed for payment applications that store, process, or transmit cardholder data. Custom payment applications endorsed by the PCI SSC (Payment Card Industry Security Standards Council) are not automatically subject to PA-DSS requirements. However, these custom applications must still meet certain security requirements outlined by the PCI SSC to ensure the protection of cardholder data.