Enforce New Required Field on Membership Renewal

We are now requiring a field for membership which we didn't before. How can I verify that this field is set when they renew membership? It doesn't seem to check for renewals on the frontend, but it does on the backend.

I'm thinking an Auto Actions of some sort, but I couldn't figure it out.

We don't have condition logic available for renewals. Just new subscriptions and upgrades. Renewals have very few limitations.

Probably the easiest way is to just intercept the renewal attempt and redirect away with CB Auto Actions. The below should work.

Global
Triggers: onCPayAfterPlanRenewalSelected
Type: Redirect
User: Self
Access: Everybody
Conditions
Condition 1
Field: Custom > Value
Custom Value: [var1_id]
Operator: Equal To
Value: PLAN_ID_HERE
Condition 2
Field: SELECT_FIELD_HERE
Operator: Not Empty
Action
URL: [cb:url location="profile_edit" /]
Message: Please complete your profile before renewing.

Replace PLAN_ID_HERE with the plan you want this to apply to. Replace SELECT_FIELD_HERE by selecting the field you want to check for. This will work for both renewal and resubscribe attempts as both go through the same trigger and process. They should be sent to profile edit with the displayed message.

I tried that, and it's not triggering. To simplify, I set it to just trigger on the plan ID and not on the new field

You need to have the field condition with it otherwise you'll redirect everyone on every renewal. Please be sure the id you supplied is the id in the far right column in CBSubs > Plans not the number under #, which is just a row count. The provided example is a confirmed working example.

What I'm seeing with the example I sent is not directing anyone, so it looks like it isn't triggering.
At what point in the process is it supposed to trigger? What I'm seeing is that I can select the plan to renew, click Reactivate, and it takes me to PayPal to pay for it.
I was assuming it would trigger before doing that (and that's what I would want it to do, catch the error before the member pays for the renewal).
And yes, the plan ID is correct. I also looked into the subscriptions table to check it for the member I'm testing with.

It should trigger immediately after clicking the button. Is the trigger correctly set to "onCPayAfterPlanRenewalSelected"?

You said clicking the button immediately goes to PayPal and doesn't display the basket at all? They might have an already initialized basket in that case and that existing basket is being paid. The usage I provided intercepts the basket before it's created.

Right click and click inspect element on the reactivate button. You should see the HTML structure there. If you could please tell me what the value of the following input shows.

Notice mine says "renew". The provided auto action is meant to intercept "renew", "reactivate", and "resubscribe". If it says "pay" then that'd explain why it's not working.