Your questions about SoFi Hong Kong are answered here

Yes. When setting up your new investment, you have the option to input an amount for your monthly contribution.

If you wish to make monthly recurring contributions and hold a bank account with HSBC / BOC, we support Direct Debit instructions. The amount you set will be directly debited from your bank account on a monthly basis. We will aim to process your Direct Debit on the 15th of every month. If the 15th falls on a Hong Kong public holiday, Direct Debit will be processed the next working day.

If you are a HSBC customer, to set up Direct Debit:

Go to your HSBC HK Mobile Banking app Log in to your HSBC personal account, select Pay & Transfer > autoPay > Set up new autoPay Select your HSBC bank account which is registered with SoFi Select SoFi Securities (Hong Kong) Limited for the Merchant/Organisation. Input your first 8-digit SoFi account ID for the Bill reference number Set frequency to Monthly. Input a maximum amount per payment. Make sure the maximum is greater than your total monthly contribution in SoFi

If you are a BOC customer, to set up Direct Debit:

Go to your bank’s website Log in to your BOC online banking, select Payment > Direct Debit Authorisation Select the tab of merchant Proxy ID / Account Number, then select Merchant Account Number. Input the Merchant Account Number: 01274600010102. The Merchant Name is: SoFi Securities (Hong Kong) Limited. Input your first 8-digit SoFi account ID as Debtor Reference. Select HKD, and select Per Month as Payment Periodicity. Select your BOC bank account which is registered with SoFi.

Unfortunately, Direct Debit is not supported for other banks at the moment.