retrieve value on post api call - terraform - terraform

Question

I have been trying to write a code using terraform which must do an API call on POST and it must get back value on post, this return value on post I must be able to use it else where in the code.
Reading a lot I noticed there are two ways to do it
Mastercard Rest API
Local-Exec and Null provider
The first one also has some issues when we try to fetch a value on post, unfortunately the API I am trying to call needs some input values to return an output. If anyone has experience in doing this using the mastercard rest api please let me know how.
My curl statement looks like this -
curl --insecure -X POST 'https://url.fqdn/get_hostname' --header 'Content-Type: application/json' --header 'Authorization: Basic tokenvalue' -d '{"key": "value","key": "value","key": "value"}'
Using local-exec and null provider
resource "null_resource" "get-hostname" {
provisioner "local-exec" {
command = <<EOF
curl --insecure -X POST 'https://url.fqdn/get_hostname' --header 'Content-Type: application/json' --header 'Authorization: Basic tokenvalue' -d '{"key1": "value1","key2": "value2"}'
EOF
}
}
How can I get the output of the command property ?

Answer 1

You can redirect the output of curl to a file, and process that file within another null_resource block with an explicit dependency on the one that writes the file.