FHIR connection with Postman and external systems

Hello, I have questions and issues with connecting the FHIR API to external systems and Postman. I have been reading the documentation but have not been able to get it to work in Postman before getting it to work in the external system. I look forward to your comments and assistance. Thank you.

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The FHIR server by default is protected by SSL auth .
It can only be accesible by a client with valid certs ,part of its trust store.

see post here to disbale SSL for the HAPI FHIR in dev mode

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Hello, I want to test Postman to generate electronic orders simulating an external system. I configured it to disable the SSL certificate, and it works correctly, but when I place the order, I get a 201 OK, but the order is not reflected in OpenElis, only in Postman with a GET.

The same thing happens with the POST for patients.