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TIDA-00637: How to add extra functionality to the existing design?

Part Number: TIDA-00637

Hi,

We want to add HMI/LCD and a payment gateway module to TIDA-00637 board.
We observed that there are no connectors (with MCU free pins) extended for external interfaces.

How do we proceed and what kind of support we can expect from TI?

Please provide your thoughts and inputs...