So there's a wallet account, where you transfer your own funds from another business account into the Airwallex account, or transfer your collected funds out of. This account has a different number depending on the currency, but the account name for that is Airwallex Ltd (this is not the customer facing account). Then the Global Accounts you setup are the accounts you can receive money in from your clients (these use your business name as the account name). They are checking accounts to collect funds, and the funds then end up in your wallet account. Typically from there you pay out yourself, suppliers or move the money to another company account.
I didn't realise there was a 90 day max limit, but I'd probably never leave it more than 30 days anyway. I'd be interested if Currenxie allows you to keep money in the account indefinitely, as they might then work well together (if you did not also have a traditional bank account elsewhere).