Need help trying to pass a variable of a related entry On my page, I have a form which is using Freeform (Solspace). 

I'm attempting to setup a custom redirect URL for the form. The form will apply to numerous entries in a channel and some will require different redirect URLs. The main channel in question (Animals) has a relation field which relates it to another channel (Adoption Price). This channel contains a URL field which ideally, I would like the user to be redirected to upon submitting the form. Below is what I have tried so far but with no luck. 

  //Setting the variable

  {% for priceBracket in entry.relatedAdoptionLink %}
      {% set priceURL = priceBracket.adoptionPriceLink %}       
  {% endfor %}

  //The Form

    {% set form = craft.freeform.form("animalAdoptionForm", {
        labelClass: "form-label",
        inputClass: "form-control",
        instructionsBelowField: true,
        overrideValues: {
          animalToAdopt: entry.title,
        }
    }) %}

    {{ form.renderTag({returnUrl: "{{priceURL}}"}) }}


Can anybody help me out with this? Setting the variable directly via the entry would be more straight forward but I'm trying to pull the information I need from a relation in another channel.

Thanks
This is how it could look like from Twig point of view. I don't know if the Solespace part is correct

{% set priceBracket = entry.relatedAdoptionLink.one() %}
{% set priceUrl = priceBracket !== null? priceBracket.getUrl() : '' %}

{{ form.renderTag({returnUrl: priceURL}) }}