High acceptance rate niches / types of business

Hi,
I would like to know based on your experience what Payment Processors / Gateways, EMIs, Banks consider as a business that is low risk and therefore accept easily the merchant account or application.

I remember trying a long time ago to apply to Paysera Card processing program with 2 businesses (Normal freelancer website providing consultation and a software website) and both got rejected, asked support later if for example a Print on demand shop will work with them, they told me it's not the kind of business that the bank they have take as they see it high risk.

kilor said:

Try eMerchantPay, they are also the one used by this forum.

There is nothing easier than Stripe, PayPal, 2Co and similar services, but you can't compare that with your own MID solutions.

Thank you for your answer Kilor, but I am more interested to know the niche types to go with.
For example, I know that Physical items are in "general" better than digital, or how dropshipping is not welcomed and such..
What's the business models that seem low risk please ?