diff --git a/lib/Payment.php b/lib/Payment.php
index d323c5ae..750f08e8 100644
--- a/lib/Payment.php
+++ b/lib/Payment.php
@@ -2,7 +2,7 @@
 use Safe\DateTimeImmutable;
 
 /**
- * @property User $User
+ * @property ?User $User
  */
 class Payment{
 	use Traits\Accessor;
@@ -19,6 +19,17 @@ class Payment{
 
 	protected ?User $_User = null;
 
+	/**
+	 * @throws Exceptions\UserNotFoundException
+	 */
+	protected function GetUser(): ?User{
+		if($this->_User === null && $this->UserId !== null){
+			$this->_User = User::Get($this->UserId);
+		}
+
+		return $this->_User;
+	}
+
 
 	// *******
 	// METHODS
diff --git a/scripts/generate-bulk-downloads b/scripts/generate-bulk-downloads
index acbdb373..535aecdd 100755
--- a/scripts/generate-bulk-downloads
+++ b/scripts/generate-bulk-downloads
@@ -2,7 +2,18 @@
 <?
 require_once('/standardebooks.org/web/lib/Core.php');
 
+use function Safe\copy;
+use function Safe\exec;
+use function Safe\file_get_contents;
+use function Safe\filemtime;
+use function Safe\getopt;
+use function Safe\glob;
 use function Safe\mkdir;
+use function Safe\opendir;
+use function Safe\preg_replace;
+use function Safe\rmdir;
+use function Safe\tempnam;
+use function Safe\unlink;
 
 $longopts = ['webroot:'];
 $options = getopt('', $longopts);
@@ -13,7 +24,7 @@ $groups = ['collections', 'subjects', 'authors', 'months'];
 $ebooksByGroup = [];
 $updatedByGroup = [];
 
-function rrmdir($src){
+function rrmdir(string $src): void{
 	// See https://www.php.net/manual/en/function.rmdir.php#117354
 	$dir = opendir($src);
 	while(false !== ($file = readdir($dir))){
@@ -32,6 +43,9 @@ function rrmdir($src){
 	rmdir($src);
 }
 
+/**
+ * @param array<Ebook> $ebooks
+ */
 function CreateZip(string $filePath, array $ebooks, string $type, string $webRoot): void{
 	$tempFilename = tempnam(sys_get_temp_dir(), "se-ebooks");
 
@@ -198,7 +212,7 @@ foreach($groups as $group){
 			mkdir($parentDir, 0775, true);
 		}
 
-		exec('attr -q -s se-ebook-count -V ' . escapeshellarg(sizeof($collection->Ebooks)) . ' ' . escapeshellarg($parentDir));
+		exec('attr -q -s se-ebook-count -V ' . escapeshellarg((string)sizeof($collection->Ebooks)) . ' ' . escapeshellarg($parentDir));
 		exec('attr -q -s se-label -V ' . escapeshellarg($collection->Label) . ' ' . escapeshellarg($parentDir));
 		exec('attr -q -s se-label-sort -V ' . escapeshellarg($collection->LabelSort) . ' ' . escapeshellarg($parentDir));
 
diff --git a/scripts/generate-feeds b/scripts/generate-feeds
index 6272727c..079ec577 100755
--- a/scripts/generate-feeds
+++ b/scripts/generate-feeds
@@ -3,11 +3,13 @@
 require_once('/standardebooks.org/web/lib/Core.php');
 
 use Safe\DateTimeImmutable;
+
+use function Safe\exec;
 use function Safe\getopt;
 use function Safe\mkdir;
 use function Safe\preg_replace;
 
-function SortByUpdatedDesc($a, $b){
+function SortByUpdatedDesc(Ebook $a, Ebook $b): int{
 	return $b->Updated <=> $a->Updated;
 }
 
@@ -31,6 +33,10 @@ function SaveFeed(Feed $feed, bool $force, ?string $label = null, ?string $label
 	}
 }
 
+/**
+ * @param array<string, array<string, string>> $collections
+ * @param array<Ebook> $ebooks
+ */
 function CreateOpdsCollectionFeed(string $name, string $url, string $description, array $collections, array $ebooks, DateTimeImmutable $now, string $webRoot, OpdsNavigationFeed $opdsRoot, bool $force): void{
 	$collator = collator_create('en_US'); // Used for sorting letters with diacritics like in author names
 	usort($collections, function($a, $b) use($collator){ return $collator->compare($a['sortedname'], $b['sortedname']); });
diff --git a/scripts/ingest-fa-payments b/scripts/ingest-fa-payments
index 48e4b1a2..58827005 100755
--- a/scripts/ingest-fa-payments
+++ b/scripts/ingest-fa-payments
@@ -18,6 +18,7 @@ use Facebook\WebDriver\Firefox\FirefoxOptions;
 
 use Safe\DateTimeImmutable;
 use function Safe\file_get_contents;
+use function Safe\file_put_contents;
 use function Safe\preg_replace;
 use function Safe\putenv;
 use function Safe\set_time_limit;
@@ -51,7 +52,7 @@ $faItemsPerPage = 20; // How many items are on a full page of FA results?
 // General plan: Read /tmp/last-fa-donation to see what the last transaction ID was that we processed.
 // If /tmp/last-fa-donation doesn't exist, get all transactions from today and create the file.
 
-function InsertTransaction($transactionId){
+function InsertTransaction(string $transactionId): bool{
 	$exists = Db::QueryInt('SELECT exists(
 					select *
 					from
@@ -151,7 +152,7 @@ try{
 
 				$transactionId = trim($td->getDomProperty('textContent'));
 
-				if($transactionId === null){
+				if($transactionId === ''){
 					continue;
 				}
 
@@ -173,7 +174,7 @@ try{
 
 				$transactionId = trim($td->getDomProperty('textContent'));
 
-				if($transactionId === null){
+				if($transactionId === ''){
 					continue;
 				}
 
@@ -215,6 +216,6 @@ catch(Exception $ex){
 	throw $ex;
 }
 finally{
-	$driver->quit();
+	$driver?->quit();
 }
 ?>
diff --git a/scripts/process-pending-payments b/scripts/process-pending-payments
index 05cc87a8..64646dd8 100755
--- a/scripts/process-pending-payments
+++ b/scripts/process-pending-payments
@@ -160,14 +160,14 @@ try{
 			$payment->Amount = floatval(str_replace('$', '', trim($detailsRow->findElement(WebDriverBy::xpath('//td[preceding-sibling::th[normalize-space(.) = "Total Amount"]]'))->getText())));
 			$payment->Fee = floatval(str_replace('$', '', trim($detailsRow->findElement(WebDriverBy::xpath('//td[preceding-sibling::th[normalize-space(.) = "Fee"]]'))->getText())));
 
-			$transactionId = $detailsRow->findElement(WebDriverBy::xpath('//td[preceding-sibling::th[normalize-space(.) = "ID"]]'))->getText();
+			$transactionId = (string)($detailsRow->findElement(WebDriverBy::xpath('//td[preceding-sibling::th[normalize-space(.) = "ID"]]'))->getText());
 			$transactionId = str_replace('View on FS', '', $transactionId);
 			$transactionId = str_replace('View on Finance', '', $transactionId);
 			$payment->TransactionId = trim($transactionId);
 
 			// We might also get a case where the donation is on behalf of a company match, but there's not really a way to distinguish that. Do a rough check.
 			// See donation 00b60a22-eafa-44cb-9850-54bef9763e8d
-			if($payment->User !== null && preg_match('/\b(L\.?L\.?C\.?|Foundation|President|Fund|Charitable)\b/ius', $payment->User->Name)){
+			if($payment->User !== null && preg_match('/\b(L\.?L\.?C\.?|Foundation|President|Fund|Charitable)\b/ius', $payment->User->Name ?? '')){
 				$payment->User = null;
 			}
 
@@ -234,8 +234,8 @@ try{
 
 						$log->Write('Sending thank you email to patron donor donating extra.');
 						$em = new Email();
-						$em->To = $payment->User->Email;
-						$em->ToName = $payment->User->Name;
+						$em->To = $payment->User->Email ?? '';
+						$em->ToName = $payment->User->Name ?? '';
 						$em->From = EDITOR_IN_CHIEF_EMAIL_ADDRESS;
 						$em->FromName = EDITOR_IN_CHIEF_NAME;
 						$em->Subject = 'Thank you for supporting Standard Ebooks!';
@@ -272,8 +272,8 @@ try{
 					if(!$payment->IsRecurring || $previousPaymentCount == 1){
 						$log->Write('Sending thank you email to non-patron donor.');
 						$em = new Email();
-						$em->To = $payment->User->Email;
-						$em->ToName = $payment->User->Name;
+						$em->To = $payment->User->Email ?? '';
+						$em->ToName = $payment->User->Name ?? '';
 						$em->From = EDITOR_IN_CHIEF_EMAIL_ADDRESS;
 						$em->FromName = EDITOR_IN_CHIEF_NAME;
 						$em->Subject = 'Thank you for supporting Standard Ebooks!';
diff --git a/scripts/update-patrons-circle b/scripts/update-patrons-circle
index 4010e0a7..f09e525f 100755
--- a/scripts/update-patrons-circle
+++ b/scripts/update-patrons-circle
@@ -4,6 +4,10 @@ require_once('/standardebooks.org/web/lib/Core.php');
 
 use Safe\DateTimeImmutable;
 
+use function Safe\file_get_contents;
+use function Safe\preg_match_all;
+use function Safe\shell_exec;
+
 // Get a list of payments that are within 1 year / 45 days of today, and deactivate Patrons Circle members
 // who aren't in that list.
 // We give a 15 day grace period to Patrons Circle members because sometimes FA can be delayed in charging.
@@ -33,7 +37,7 @@ if(sizeof($expiredPatrons) > 0){
 
 	// We can't use the Library class to get ebooks because this script is typically run via cron or CLI,
 	// which doesn't have access PHP-FMP's APCu cache.
-	foreach(explode("\n", trim(shell_exec('find ' . EBOOKS_DIST_PATH . ' -name "content.opf"') ?? '')) as $filename){
+	foreach(explode("\n", trim(shell_exec('find ' . EBOOKS_DIST_PATH . ' -name "content.opf"'))) as $filename){
 		$metadata = file_get_contents($filename);
 
 		// Don't create a new Ebook object because that's very slow. Just do a regex match for speed.
@@ -77,7 +81,7 @@ if(sizeof($expiredPatrons) > 0){
 			$em->From = EDITOR_IN_CHIEF_EMAIL_ADDRESS;
 			$em->FromName = EDITOR_IN_CHIEF_NAME;
 			$em->To = $patron->User->Email;
-			$em->ToName = $patron->User->Name;
+			$em->ToName = $patron->User->Name ?? '';
 			$em->Subject = 'Will you still help us make free, beautiful digital literature?';
 
 			if($lastPayment[0]->IsRecurring){