How to use curl and here-documents to post a JSON document to create an issue in Jira in a more readable way

jira-curl.sh

JIRA_REST_URL="${JIRA_REST_URL:-https://MYCOMPANY.jira.com/rest/api/2}"
JIRA_CREDENTIALS="${JIRA_CREDENTIALS:-user:password}"

# https://developer.atlassian.com/jiradev/api-reference/jira-rest-apis/jira-rest-api-tutorials/jira-rest-api-example-discovering-meta-data-for-creating-issues

# https://MYCOMPANY.jira.com/rest/api/2/issue/createmeta?projectKeys=MYPROJ&issuetypeNames=MyIssueType&expand=projects.issuetypes.fields
# customfield_10171: My Custom Field Name 1
# customfield_10172: My Custom Field Name 2

# This methods create a new issue of type 'MyIssueType' in project 'MYPROJ' with 2 custom fields
# and prints the key for the newly created issue
jira_new_MyIssueType() {

  local jira_data="$(cat <<-EOF
  {"fields":{

    "summary": "This is a test summary",
    "description": "Description here please",
    "project": { "key": "MYPROJ" },
    "issuetype": { "name": "MyIssueType"},
    "customfield_10171": {"value":"My-value-1"},
    "customfield_10172": [{"value":"My-value-2"}]
  }}
  EOF
  )" 

  curl -D- -u "$JIRA_CREDENTIALS" -X POST --data "$jira_data" -H "Content-Type: application/json" $JIRA_REST_URL/issue/ \
  | sed -re 's/^.*"key":"([^"]+)".*/\1/'

}