Camunda Platform 7 (camunda run 7.21.0) problem with an external databank

I have an external databank as a JSON databank. I am using express rest API and camunda BPMN 7.21 and camunda run 7.21.0 to make a simple hotel booking management system.
When I am making PUT calls from the camunda itself, the actual changes are not reflected in my databank. However, if I make the PUT calls from a software like Postman, everything works.
I am still new to BPMN and maybe this is a dumb question, but I would be really thankful if anyone could answer me on this.

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