Bubble Setup

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

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

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

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

Signature Calculations for the Authorization Header: Transferring Payload in a Single Chunk (AWS Signature Version 4) - Amazon Simple Storage Service
Amazon Simple Storage Service

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

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On this page
View the link for plugin installs with bubble.io
API Workflow setup (requires a paid bubble.io plan - due to server side action)
Create an API workflow
Connect your API workflow to a Page
Example Call ( DO NOT return signature result to a page - view privately in database instead )
API Backend setup
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)
Capturing the result