Can't remove PayPal as a payment option

Can't remove PayPal as a payment option

I'm on the free version of Zoho Books and enabled Stripe and Braintree for CC transactions, Stripe for ACH transactions, and PayPal.  I created a payment link and tested it by clicking into it, but I noticed that the only option that appeared in the link was PayPal and Venmo.  Why do Stripe and Braintree not show up?

I subsequently deleted the payment link from my account, then tried to disable PayPal as a payment gateway, but I get an error saying that transactions are still in progress.  So, I cannot delete PayPal, but I also can't use another payment gateway.  I would like to only allow ACH payments.

Anyone have any ideas on what's going wrong?