diff --git a/public_html/authenticators/change.php b/public_html/authenticators/change.php
new file mode 100644
index 0000000..c8c0cf7
--- /dev/null
+++ b/public_html/authenticators/change.php
@@ -0,0 +1,40 @@
+<?php
+/*
+ * ReDonate is more free software. It is licensed under the WTFPL, which
+ * allows you to do pretty much anything with it, without having to
+ * ask permission. Commercial use is allowed, and no attribution is
+ * required. We do politely request that you share your modifications
+ * to benefit other developers, but you are under no enforced
+ * obligation to do so :)
+ * 
+ * Please read the accompanying LICENSE document for the full WTFPL
+ * licensing text.
+ */
+
+if(!isset($_APP)) { die("Unauthorized."); }
+
+try
+{
+	$sChangeRequest = new ChangeRequest($router->uParameters[2]);
+}
+catch (NotFoundException $e)
+{
+	throw new RouterException("No such change request exists.");
+}
+
+if($sChangeRequest->sSubscription->uEmailAddress != $router->uParameters[1])
+{
+	throw new RouterException("The given e-mail address does not match the e-mail address for this change request.");
+}
+
+if($sChangeRequest->uKey != $router->uParameters[3])
+{
+	throw new RouterException("The given key does not match the key for this change request.");
+}
+
+if($sChangeRequest->sIsConfirmed === true)
+{
+	throw new RouterException("The change request was already fulfilled.");
+}
+
+$sRouterAuthenticated = true;
diff --git a/public_html/classes/changerequest.php b/public_html/classes/changerequest.php
new file mode 100644
index 0000000..625528b
--- /dev/null
+++ b/public_html/classes/changerequest.php
@@ -0,0 +1,72 @@
+<?php
+/*
+ * projectname is more free software. It is licensed under the WTFPL, which
+ * allows you to do pretty much anything with it, without having to
+ * ask permission. Commercial use is allowed, and no attribution is
+ * required. We do politely request that you share your modifications
+ * to benefit other developers, but you are under no enforced
+ * obligation to do so :)
+ * 
+ * Please read the accompanying LICENSE document for the full WTFPL
+ * licensing text.
+ */
+ 
+if(!isset($_APP)) { die("Unauthorized."); }
+
+class ChangeRequest extends CPHPDatabaseRecordClass
+{
+	public $table_name = "change_requests";
+	public $fill_query = "SELECT * FROM change_requests WHERE `Id` = :Id";
+	public $verify_query = "SELECT * FROM change_requests WHERE `Id` = :Id";
+	
+	public $prototype = array(
+		'string' => array(
+			'OldCurrency'		=> "OldCurrency",
+			'NewCurrency'		=> "NewCurrency",
+			'Key'			=> "Key"
+		),
+		'numeric' => array(
+			'SubscriptionId'	=> "SubscriptionId",
+			'CampaignId'		=> "CampaignId",
+			'OldAmount'		=> "OldAmount",
+			'NewAmount'		=> "NewAmount"
+		),
+		'boolean' => array(
+			'IsConfirmed'		=> "Confirmed"
+		),
+		'timestamp' => array(
+			'Date'			=> "Date"
+		),
+		'campaign' => array(
+			'Campaign'		=> "CampaignId"
+		),
+		'subscription' => array(
+			'Subscription'		=> "SubscriptionId"
+		)
+	);
+	
+	public function GenerateEmail()
+	{
+		global $locale;
+		
+		$sText = NewTemplater::Render("email/change.txt", $locale->strings, array(
+			"campaign-name" => $this->sCampaign->sName,
+			"confirmation-url" => "http://redonate.net/change/{$this->sSubscription->sEmailAddress}/{$this->sId}/{$this->sKey}",
+			"unsubscribe-url" => "http://redonate.com/manage/{$this->sSubscription->sEmailAddress}/{$this->sSubscription->sSettingsKey}",
+			"old" => Currency::Format($this->sOldCurrency, $this->sOldAmount),
+			"new" => Currency::Format($this->sNewCurrency, $this->sNewAmount)
+		));
+		
+		$sHtml = NewTemplater::Render("email/layout.html", $locale->strings, array(
+			"contents" => NewTemplater::Render("email/change.html", $locale->strings, array(
+				"campaign-name" => $this->sCampaign->sName,
+				"confirmation-url" => "http://redonate.net/change/{$this->sSubscription->sEmailAddress}/{$this->sId}/{$this->sKey}",
+				"unsubscribe-url" => "http://redonate.com/manage/{$this->sSubscription->sEmailAddress}/{$this->sSubscription->sSettingsKey}",
+				"old" => Currency::Format($this->sOldCurrency, $this->sOldAmount),
+				"new" => Currency::Format($this->sNewCurrency, $this->sNewAmount)
+			))
+		));
+		
+		return array("text" => $sText, "html" => $sHtml);
+	}
+}
diff --git a/public_html/modules/change.php b/public_html/modules/change.php
new file mode 100644
index 0000000..5d89bb2
--- /dev/null
+++ b/public_html/modules/change.php
@@ -0,0 +1,24 @@
+<?php
+/*
+ * ReDonate is more free software. It is licensed under the WTFPL, which
+ * allows you to do pretty much anything with it, without having to
+ * ask permission. Commercial use is allowed, and no attribution is
+ * required. We do politely request that you share your modifications
+ * to benefit other developers, but you are under no enforced
+ * obligation to do so :)
+ * 
+ * Please read the accompanying LICENSE document for the full WTFPL
+ * licensing text.
+ */
+
+if(!isset($_APP)) { die("Unauthorized."); }
+
+$sChangeRequest->sSubscription->uCurrency = $sChangeRequest->uNewCurrency;
+$sChangeRequest->sSubscription->uAmount = $sChangeRequest->uNewAmount;
+$sChangeRequest->sSubscription->InsertIntoDatabase();
+
+$sChangeRequest->uIsConfirmed = true;
+$sChangeRequest->InsertIntoDatabase();
+
+flash_notice("The change was successfully applied.");
+redirect("/manage/{$sChangeRequest->sSubscription->sEmailAddress}/{$sChangeRequest->sSubscription->sSettingsKey}");
diff --git a/public_html/modules/error/nosuchchange.php b/public_html/modules/error/nosuchchange.php
new file mode 100644
index 0000000..b095822
--- /dev/null
+++ b/public_html/modules/error/nosuchchange.php
@@ -0,0 +1,16 @@
+<?php
+/*
+ * ReDonate is more free software. It is licensed under the WTFPL, which
+ * allows you to do pretty much anything with it, without having to
+ * ask permission. Commercial use is allowed, and no attribution is
+ * required. We do politely request that you share your modifications
+ * to benefit other developers, but you are under no enforced
+ * obligation to do so :)
+ * 
+ * Please read the accompanying LICENSE document for the full WTFPL
+ * licensing text.
+ */
+
+if(!isset($_APP)) { die("Unauthorized."); }
+
+throw new NotFoundException("No such change request was found.");
diff --git a/public_html/modules/subscribe.php b/public_html/modules/subscribe.php
index 9813730..0dbadd2 100644
--- a/public_html/modules/subscribe.php
+++ b/public_html/modules/subscribe.php
@@ -53,6 +53,7 @@ try
 		if($sSubscription->sCampaignId == $sCampaign->sId && $sSubscription->sIsActive == true)
 		{
 			$exists = true;
+			$sExistingSubscription = $sSubscription;
 		}
 	}
 	
@@ -65,7 +66,23 @@ catch (NotFoundException $e)
 if($exists)
 {
 	$sPageContents = NewTemplater::Render("subscription/change", $locale->strings, array());
-	/* TODO: Change request */
+	
+	$sChangeRequest = new ChangeRequest(0);
+	$sChangeRequest->uKey = random_string(16);
+	$sChangeRequest->uOldCurrency = $sExistingSubscription->sCurrency;
+	$sChangeRequest->uOldAmount = $sExistingSubscription->sAmount;
+	$sChangeRequest->uNewCurrency = $_POST['currency'];
+	$sChangeRequest->uNewAmount = str_replace(",", ".", $_POST['amount']);
+	$sChangeRequest->uSubscriptionId = $sExistingSubscription->sId;
+	$sChangeRequest->uCampaignId = $sExistingSubscription->sCampaign->sId;
+	$sChangeRequest->uIsConfirmed = false;
+	$sChangeRequest->uDate = time();
+	$sChangeRequest->InsertIntoDatabase();
+	
+	$sEmail = $sChangeRequest->GenerateEmail();
+	
+	send_mail($sExistingSubscription->sEmailAddress, "Changes to your pledge to {$sExistingSubscription->sCampaign->sName}", $sEmail['text'], $sEmail['html']);
+	
 	return;
 }
 
diff --git a/public_html/rewrite.php b/public_html/rewrite.php
index 063b342..3918e26 100644
--- a/public_html/rewrite.php
+++ b/public_html/rewrite.php
@@ -78,6 +78,11 @@ $router->routes = array(
 			'authenticator' => "authenticators/payment.php",
 			'auth_error' => "modules/error/nosuchpayment.php"
 		),
+		"^/change/(.+)/([0-9]+)/([a-zA-Z0-9]+)$"	=> array(
+			'target' => "modules/change.php",
+			'authenticator' => "authenticators/change.php",
+			'auth_error' => "modules/error/nosuchchange.php"
+		),
 		"^/manage/(.+?)/([a-zA-Z0-9]+)/change-amount$"		=> array(
 			'target' => "modules/subscription/change_amount.php",
 			'authenticator' => "authenticators/subscription.php",
diff --git a/public_html/templates/email/change.html.tpl b/public_html/templates/email/change.html.tpl
new file mode 100644
index 0000000..9bd5115
--- /dev/null
+++ b/public_html/templates/email/change.html.tpl
@@ -0,0 +1,44 @@
+<p>
+	Hi there,
+</p>
+
+<p>
+	You entered your e-mail address for a campaign that you already
+	subscribed to in the past. If you meant to change your settings, please
+	click the confirmation link, and we'll update your settings.
+</p>
+
+<p>
+	If you didn't mean to change your settings and want to keep things as
+	they were before, you can simply ignore this e-mail. If you have any
+	further questions, don't hesitate to reply to this e-mail!
+</p>
+
+<p>
+	Campaign: {%?campaign-name}
+</p>
+
+<p>
+	Previous monthly amount: {%?old}
+</p>
+
+<p>
+	<strong>New monthly amount: {%?new}</strong>
+</p>
+
+<p>
+	Click this link to confirm the change: 
+	<a href="{%?confirmation-url}">{%?confirmation-url}</a>
+</p>
+
+<p>
+	<em>- Sven Slootweg, ReDonate</em>
+</p>
+
+<hr>
+
+<p>
+	If you want to cancel your donation pledge or change your settings, please visit
+	<a href="{%?unsubscribe-url}">{%?unsubscribe-url}</a>.
+</p>
+
diff --git a/public_html/templates/email/change.txt.tpl b/public_html/templates/email/change.txt.tpl
new file mode 100644
index 0000000..32d75a0
--- /dev/null
+++ b/public_html/templates/email/change.txt.tpl
@@ -0,0 +1,25 @@
+Hi there,
+
+You entered your e-mail address for a campaign that you already
+subscribed to in the past. If you meant to change your settings, please
+click the confirmation link, and we'll update your settings.
+
+If you didn't mean to change your settings and want to keep things as
+they were before, you can simply ignore this e-mail. If you have any
+further questions, don't hesitate to reply to this e-mail!
+
+Campaign: {%?campaign-name}
+
+Previous monthly amount: {%?old}
+
+New monthly amount: {%?new}
+
+Click this link to confirm the change: {%?confirmation-url}
+
+- Sven Slootweg, ReDonate
+
+-----
+
+If you want to cancel your donation pledge or change other settings, 
+please visit {%?unsubscribe-url}.
+