If you don’t have a Chinese bank account you can’t use standard Alipay. When you install it and select the international version when signing up - after verifying you’ll be able to top up your Alipay account using any Mastercard (i.e Monzo’s) or Visa debit card. Be aware that it’s designed for temporary use whilst travelling and the accounts may even have an expiry date attached to them.
You will not be able to send money to your Alipay account using Transferwise as it’s not a bank account.
What exactly are you wanting to use Alipay for anyway? There might be some different recommendations I or someone else could make if it was clear.