Run an internal POST REST API call in a post function

[NCATS LAB]

I have a Single Select custom field that I want to add options to it dynamically based on the value entered into a text field. 

I currently am able to run a curl script that can update this option, but I want to find a way to have this happen automatically in a workflow post-function. 

For further reference, I am using the Customfield Editor Plugin (https://marketplace.atlassian.com/apps/1212096/customfield-editor-plugin?hosting=server&tab=overview)

I do not have Script Runner, and at this point I have been told that we are not purchasing any more add ons. 

Does anyone have any suggestions on how I may be able to automate this process? I am not locked into a post-function. I just can't think of another way to automate this.

[Brant Schroeder]

You can create a Webhook and use the Trigger a Webhook post function.  If you have scriptrunner you could use a custom script post-function to accomplish it as well.

[NCATS LAB]

I actually had considered that, but I am not sure that I can create a Jira webhook to itself. Do you know a way to do this?

[Brant Schroeder]

You connect to the API.

[NCATS LAB]

Brant, that is exactly what this is all about. I am trying to figure out how to run a curl script that calls the API automatically when an issue is created.