Twilio and US A2P / Multiple Accounts
When looking to register with US A2P or using multiple sub-accounts for your clients, Twilio will send you the following message:
"If you are a sole proprietor and you send messages to the US using your own brand (Direct Customers), but you always send fewer than 3,000 messages per day to the US using 5 or fewer long code numbers, you do not need to do anything at this time."
What this means is that unless you are sending more than 3,000 messages per day (you likely will never come close) and using more than 5 different Twilio numbers (also unlikely) than you do not need to worry about this and can just use Twilio through your one account.