Bubble Setup

API Workflow setup (requires a paid bubble.io plan - due to server side action)

1. Click settings, 2. click API, 3.Click Enable Workflow API

Create an API workflow

Click the dotted line box (Click here to add a "BACKEND" workflow...)

Connect your API workflow to a Page

API workflow Connected to PAGE AWS4 through action "schedule a workflow"

Example Call ( DO NOT return signature result to a page - view privately in database instead )

API Backend setup

Adding an API action for the AWS Signature Version 4 plugin
This is the test data that can be used to see if the plugin setup is correct. \n represents newline character

For more examples, and the current example in the image please review the following docs from Amazon AWS

Find & Replace to maintain line breaks (from dynamic values)

\s will match spaces created by storing multi-line "string to sign" in the database

Capturing the result

Risk is limited to the privacy settings you choose