GitHub Actions get from API to create pull request - github

Question

Is there a way to tell GitHub to automatically create a pull request from an API providing JSON content and merge it into my project?
I want to:
Edit files on a platform (I control the platform) using my own production editors/tools.
Have GitHub request it (REST), then create a PR or a commit, so people can collaborate on it with forks/GitHub project management.
Push from GitHub back to the platform for publishing.
3 is no problem, but 2 I can't find documentation for if it's even possible.

Answer 1

name: Manual workflow
on:
workflow_dispatch:
jobs:
makefiles:
# The type of runner that the job will run on
runs-on: ubuntu-latest
# Steps represent a sequence of tasks that will be executed as part of the job
steps:
- uses: actions/checkout#v2
- name: Getting
uses: fjogeleit/http-request-action#master
id: myRequest
with:
url: 'https://domain/api/file'
method: 'GET'
- name: Show File
run: echo ${{ steps.myRequest.outputs.response }}
- name: Create A File
uses: 1arp/create-a-file-action#0.2
with:
path: 'src'
file: 'foo.bar'
content: ${{steps.myRequest.outputs.response}}
- name: final commit
uses: zwaldowski/git-commit-action#v1
id: git_commit
- name: show
run: echo "${{ steps.git_commit.outputs.sha }}"