Recently I received a number of questions from people who were using the first self-monetization example code I created about a year ago. They received an error message when installing the app: Callback functions are not allowed.
![](https://i0.wp.com/365community.online/wp-content/uploads/2019/06/Outbound-HTTP-calls-blocked-in-Business-Central-Sandbox.png?w=838&ssl=1)
This error happened because there is code in the install codeunit to do an outgoing HTTP call to a webservice. In the same period, people started to report…
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Outbound HTTP calls blocked in Business Central Sandbox
Recently I received a number of questions from people who were using the first self-monetization example code I created about a year ago. They received an error message when installing the app: Callback functions are not allowed. This error happened because there is code in the install codeunit to do an outgoing HTTP call to a webservice.
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