Create a rule
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Log in to the Cloudflare dashboard ↗, and select your account and domain. 
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Go to Security > WAF > Tools. 
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Under IP Access Rules, enter the following details: - For Value, enter an IP address, IP range, country code/name, or Autonomous System Number (ASN). For details, refer to Parameters.
- Select an action.
- For Zone, select whether the rule applies to the current website only or to all websites in the account.
- (Optional) Enter a note for the rule (for example, Payment Gateway).
 
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Select Add. 
Use the Cloudflare API to programmatically create IP Access rules. For more information, refer to Get IP Access rules.