Bubble + Mercado Pago (Mercadopago - Checkout Pro Renato Asse Plugin): Webhook not returning external_reference

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Issue Description: I am integrating Mercado Pago into Bubble using the Mercadopago - Checkout Pro Renato Asse Plugin. While the payment is created successfully and the webhook triggers as expected, I’m facing a critical issue when trying to identify the user.

The Problem: In my Backend Workflow, Step 1 (Consultar Notificação Payment) successfully receives the ID from the webhook. However, when I try to use the results of that step in Step 2 (Make changes to Empleador), the external_reference field comes up empty/null. Since the external_reference is missing, the search for the specific unique_id fails, and the user’s subscription status is never updated.

This is my workflow:

Frontend Workflow:

  1. Button “Elegir plan” is clicked.

  2. Step 1: Mercadopago - Criar preferencia

    • Notification URL: https://nanasperu.com/version-test/api/1.1/wf/mercadopago_webhook

    • External Reference: Current User's Empleador's Unique ID

  3. Step 2: Open an external website

    • Destination: Result of step 1's sandbox_init_point

Backend Workflow:

  1. API Event: mercadopago_webhook

    • Expose as a public API workflow: Checked

    • Parameter definition: Detect request data

  2. Step 1: Mercadopago - Consultar Notificação Payment

    • (path) ID_payment: Request Data's body id

  3. Step 2: Make changes to Empleador…

    • Search for Empleador (First item)

    • Constraint: unique_id = Result of step 1's body external_reference <— This is where it fails (returns null)

    • Field: subscription_active = "yes"

Has anyone experienced the Mercadopago - Checkout Pro Renato Asse Plugin not returning the external_reference even when the payment ID is valid? Is there a different way to fetch the payment details or a specific setting in Mercado Pago’s dashboard that I might be missing?

Any help would be greatly appreciated!

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