fix: pass stirng to redirect_to funciton

app/controllers/members/payments_controller.rb

@@ -45,6 +45,7 @@ def pay_activities
       transaction_type: :activity,
       redirect_uri: member_payments_path
     )
+
     if payment.save
       # Check URI for safety (supresses brakeman warning)
       url = begin
@@ -55,7 +56,7 @@ def pay_activities
 
       # Check if it's a valid URI and matches your whitelist of acceptable domains (e.g., only http(s)://example.com)
       if url.is_a?(URI::HTTP) && ['mollie.com'].include?(url.host)
-        redirect_to(url)
+        redirect_to(url.to_s)
       else
         # Fallback to a safe default redirect if the URI is invalid or not in the whitelist
         redirect_to(root_path)