You can have as many as you want. However the most important thing is that do you really need more multiple merchant accounts Lets take an example of a business in United states that is processing 25,000 USD per month and wishes to grow. Most USA based processors in USA will not allow over 25 K USD volume each month. So in this case you will need an additional merchant account.
This problem can be solved in multiple ways.
- Get additional merchant accounts to cater the volume
- Start accepting payments with Echeck and ACH.
- Start accepting cryptocurrencies
- Get an offshore merchant account that offers a bigger monthly sales volume Hope this helps.