Use Braintree CIDR /26 in Firewall

Hello, I am having trouble understanding the CIDR notation (whilst I am a developer, I am not a network specialist at all). Is it possible to convert from /26 (which Braintree supplies) to /24 (which Cloudflare allows)?

Or are there alternatives that are still better than manually adding each individual IP address into the Cloudflare Firewall?

Thanks for any help, even just a link to an article which explains CIDR in a way that a non-expert can understand.

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