My gas[1] and electric[2] companies are both subsidiaries of Avangrid, their websites and payment portals are practically identical, but one of them lets me use

My gas[1] and electric[2] companies are both subsidiaries of Avangrid, their websites and payment portals are practically identical, but one of them lets me use a credit card and the other doesn't. I always wondered if there was a regulatory reason for it, or maybe if it dates back to arbitrarily different company policies when they were independent of each other. [1] https://www.soconngas.com https://www.soconngas.com [2] https://www.uinet.com https://www.uinet.com