mattwire
--- a/Civi/UpdaterecurWorker.php
+++ b/Civi/UpdaterecurWorker.php
   *
   * @return String HTML to add to activity details field.
   */
-  public function updateRecurAndTemplateContribution(array $changeActivity, int $recurID) :string {
-
+  public function updateRecurAndTemplateContribution(int $recurID, float $newAmount) :string {
--- a/Civi/UpdaterecurWorker.php
+++ b/Civi/UpdaterecurWorker.php

-    // As it succeeded, we can update the ContributionRecur
-    $htmlLog = $this->updateRecurAndTemplateContribution($changeActivity, $recur['id']);
-
-    $htmlLog .= '<p> '. date('Y-m-d H:i:s ') . E::ts(
+    if (empty($message)) {
+      // The Payment Processor might not return any message if it was successful
+      $message = 'OK';
+    }
+    $htmlLog = '<p> '. date('Y-m-d H:i:s ') . E::ts(
        "<p><strong>Successfully updated.</strong> Recurring contribution ID %1 was updated by the payment processor (changeSubscriptionAmount): %2</p>\n",
        [1 => $recur['id'], 2 => $message]
      );

+    // As it succeeded, we can update the ContributionRecur
+    $htmlLog .= $this->updateRecurAndTemplateContribution($recur['id'], $newAmount);