Check for existing recur

Civi/StripeImport/Subscription.php

@@ -87,6 +87,17 @@ class Subscription extends Base {
     // Make sure we have a Contact ID
     $this->deriveContactIDFromCustomer($stripeSubscription);
 
+    // Check if we already have a recurring contribution
+    if (!$this->hasContributionRecurID()) {
+      $contributionRecur = \Civi\Api4\ContributionRecur::get(FALSE)
+        ->addWhere('processor_id', '=', $this->getStripeSubscriptionID())
+        ->addWhere('is_test', '=', $this->paymentProcessor->getPaymentProcessor()['is_test'])
+        ->execute()
+        ->first();
+      if (!empty($contributionRecur)) {
+        $this->setContributionRecurID($contributionRecur['id']);
+      }
+    }
     if (!$this->hasContributionRecurID()) {
       // No existing recurring contribution - create one
       $contributionRecurParams = [