diff --git a/CRM/Tbusainvoicegen/Timebank.php b/CRM/Tbusainvoicegen/Timebank.php
index 49c0026..7251eff 100644
--- a/CRM/Tbusainvoicegen/Timebank.php
+++ b/CRM/Tbusainvoicegen/Timebank.php
@@ -3,15 +3,16 @@
 class CRM_Tbusainvoicegen_Timebank {
 
   // Live settings
-  const TBBILLABLEFIELD = 'custom_233';
-  const BILLABLEMEMBERFIELD = 'custom_236';
-  const BILLINGPERIODFIELD = 'custom_228';
-  const TBCREATED = 'custom_112';
+  // const TBBILLABLEFIELD = 'custom_233';
+  // const BILLABLEMEMBERFIELD = 'custom_236';
+  // const BILLINGPERIODFIELD = 'custom_228';
+  // const TBCREATED = 'custom_112';
 
   // Local dev settings.
-  //  const TBBILLABLEFIELD = 'custom_9';
-  //  const BILLABLEMEMBERFIELD = 'custom_10';
-  //  const BILLINGPERIODFIELD = 'custom_11';
+   const TBBILLABLEFIELD = 'custom_9';
+   const BILLABLEMEMBERFIELD = 'custom_10';
+   const BILLINGPERIODFIELD = 'custom_11';
+   const TBCREATED = 'custom_27';
 
   /**
    * Set the pricing here.
@@ -98,7 +99,11 @@ class CRM_Tbusainvoicegen_Timebank {
     foreach ($contacts as $k => $contact) {
       if (!in_array($k, self::$contributionExists)) {
         $tb = new CRM_Tbusainvoicegen_Timebank($k, $contact[self::BILLABLEMEMBERFIELD]);
-        $tb->$dateCreated = new DateTime($contact[self::TBCREATED]);
+        // Don't generate an invoice if there's no "TB Created" date.
+        if (!$contact[self::TBCREATED]) {
+          continue;
+        }
+        $tb->creationDate = new DateTime($contact[self::TBCREATED]);
         $tb->setPrice();
         $tb->createContribution();
       }
@@ -137,11 +142,12 @@ class CRM_Tbusainvoicegen_Timebank {
     $adjustedMemberCount = $this->memberCount - 2;
     foreach ($this->priceArray as $members => $cost) {
       if ($adjustedMemberCount <= $members) {
-        $this->price = $cost * $this->monthsProRated();
         break;
+        // After this "break", $cost will be accurate.
       }
     }
     // Pro-rate the payment if the timebank is new enough.
+    $this->price = round($cost * $this->monthsProRated() / 6, 2);
     return $this->price;
   }
 
@@ -153,12 +159,28 @@ class CRM_Tbusainvoicegen_Timebank {
   private function monthsProRated() {
     // By default, we bill all 6 months in a billing period.
     $monthsProRated = 6;
-    $beginDate = $this->calculatePeriodBeginDate;
-    $firstAnniversary = $this->$creationDate->modify("+1 year");
+    $beginDate = $this->calculatePeriodBeginDate();
+    $firstAnniversary = $this->creationDate->modify("+1 year");
     $interval = $beginDate->diff($firstAnniversary);
+    // First anniversary is before the billing period.
+    if ($interval->invert == 1) {
+      $monthsProRated = 6;
+    }
+    // Starts past the end of the billing period.
+    elseif ($interval->y >= 1 || $interval->m >= 6) {
+      $monthsProRated = 0;
+    }
+    // Falls within the billing period.
+    else {
+      $monthsProRated = 5 - $interval->m;
+    }
+    return $monthsProRated;
   }
 
   private function createContribution() {
+    if (!$this->price) {
+      return;
+    }
     $dueDate = $this->calculateDueDate();
     civicrm_api3('Contribution', 'create', [
       'financial_type_id' => 'CW License Fee',