Essential: Your application should really validate which the callback request is approved by checking the HTTP headers (you'll be able to determine them after you subscribe your webhook inside the Business Centre). Payment affirmation. Every time a user is earning a payment, requesting a a person-time code sent via SMS http://promotionalsmsprovider99876.alltdesign.com/the-single-best-strategy-to-use-for-sms-otp-api-32810663