What each one actually does
Paystack is a licensed payment processor that handles card acquiring, bank transfers, and settlement in Nigeria and select African markets. They own the rails for the payments they process.
PayKato is not a processor and is not a bank. PayKato provides merchant-facing software — invoicing, payment links, dashboard, KYB onboarding, settlement reconciliation — and routes payments to licensed processor and payout partners. Specific partner availability is confirmed during onboarding.