This is Rae from Shopify. Thanks for reaching out about this.
Which country is your business based in? Once I have this information, I can help clarify which gateways are available to you.
In the meantime though, I recommend visiting this link and selecting the country where you're located. This will bring up a list of all the gateways that can be used on your store. However, it's important to note that any gateways on this list - except for Shopify Payments - are third party gateways. So, if you have any questions or concerns about using one of these gateways on your site, please make sure to reach out to the gateway's support team directly for more help.
I look forward to hearing back from you with confirmation on where your business is based so I can help provide a list of potential gateways for you to consider.