diff --git a/app/Models/Subscription.php b/app/Models/Subscription.php
index 960817cac99c..9fd27cbfee2f 100644
--- a/app/Models/Subscription.php
+++ b/app/Models/Subscription.php
@@ -11,7 +11,9 @@
 
 namespace App\Models;
 
+use App\Services\Subscription\PaymentLinkService;
 use App\Services\Subscription\SubscriptionService;
+use App\Services\Subscription\SubscriptionStatus;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\SoftDeletes;
 
@@ -132,6 +134,16 @@ class Subscription extends BaseModel
         return new SubscriptionService($this);
     }
 
+    public function link_service(): PaymentLinkService
+    {
+        return new PaymentLinkService($this);
+    }
+
+    public function status(RecurringInvoice $recurring_invoice): SubscriptionStatus
+    {
+        return (new SubscriptionStatus($this, $recurring_invoice))->run();
+    }
+
     public function company(): \Illuminate\Database\Eloquent\Relations\BelongsTo
     {
         return $this->belongsTo(Company::class);
diff --git a/app/Services/Subscription/PaymentLinkService.php b/app/Services/Subscription/PaymentLinkService.php
new file mode 100644
index 000000000000..baff45ea74dd
--- /dev/null
+++ b/app/Services/Subscription/PaymentLinkService.php
@@ -0,0 +1,81 @@
+<?php
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2023. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://www.elastic.co/licensing/elastic-license
+ */
+
+namespace App\Services\Subscription;
+
+use App\Models\PaymentHash;
+use App\Models\Subscription;
+use App\Models\ClientContact;
+use App\Models\RecurringInvoice;
+
+class PaymentLinkService
+{
+
+    public const WHITE_LABEL = 4316;
+
+    public function __construct(public Subscription $subscription)
+    {
+    }
+    
+    /**
+     * CompletePurchase
+     *
+     * Perform the initial purchase of a one time 
+     * or recurring product
+     * 
+     * @param  PaymentHash $payment_hash
+     * @return Illuminate\Routing\Redirector
+     */
+    public function completePurchase(PaymentHash $payment_hash): \Illuminate\Routing\Redirector|\Illuminate\Http\RedirectResponse
+    {
+
+    }
+
+    /**
+     * isEligible
+     * ["message" => "Success", "status_code" => 200];
+     * @param  ClientContact $contact
+     * @return array{"message": string, "status_code": int}
+     */
+    public function isEligible(ClientContact $contact): array
+    {
+        
+    }
+
+    /* Starts the process to create a trial
+        - we create a recurring invoice, which has its next_send_date as now() + trial_duration
+        - we then hit the client API end point to advise the trial payload
+        - we then return the user to either a predefined user endpoint, OR we return the user to the recurring invoice page.
+
+     * startTrial
+     *
+     * @param  array $data{contact_id: int, client_id: int, bundle: \Illuminate\Support\Collection, coupon?: string, }
+     * @return Illuminate\Routing\Redirector
+     */
+    public function startTrial(array $data): \Illuminate\Routing\Redirector|\Illuminate\Http\RedirectResponse
+    {
+
+    }
+    
+    /**
+     * calculateUpdatePriceV2
+     *
+     * Need to change the naming of the method
+     * 
+     * @param  RecurringInvoice $recurring_invoice - The Current Recurring Invoice for the subscription.
+     * @param  Subscription $target - The new target subscription to move to
+     * @return float - the upgrade price
+     */
+    public function calculateUpgradePriceV2(RecurringInvoice $recurring_invoice, Subscription $target): ?float
+    {
+       return (new UpgradePrice($recurring_invoice, $target))->run();
+    }
+}
\ No newline at end of file
diff --git a/app/Services/Subscription/ProRata.php b/app/Services/Subscription/ProRata.php
index da69dd7e560c..9dfc355ba2f0 100644
--- a/app/Services/Subscription/ProRata.php
+++ b/app/Services/Subscription/ProRata.php
@@ -121,7 +121,7 @@ class ProRata extends AbstractService
      */
     private function checkRefundPeriod(): self
     {
-        if(!$this->subscription->refund_period || $this->subscription->refund_period === 0)
+        if(!$this->recurring_invoice->subscription->refund_period || $this->recurring_invoice->subscription->refund_period === 0)
             return $this->setRefundable(false);
     
         $primary_invoice = $this->recurring_invoice
@@ -133,7 +133,7 @@ class ProRata extends AbstractService
 
         if($primary_invoice &&
         $primary_invoice->status_id == Invoice::STATUS_PAID &&
-        Carbon::parse($primary_invoice->date)->addSeconds($this->subscription->refund_period)->lte(now()->startOfDay()->addSeconds($primary_invoice->client->timezone_offset()))
+        Carbon::parse($primary_invoice->date)->addSeconds($this->recurring_invoice->subscription->refund_period)->lte(now()->startOfDay()->addSeconds($primary_invoice->client->timezone_offset()))
         ){
             return $this->setRefundable(true);
         }
@@ -213,7 +213,7 @@ class ProRata extends AbstractService
     private function isInTrialPeriod(): self
     {
 
-        if(!$this->subscription->trial_enabled) 
+        if(!$this->recurring_invoice->subscription->trial_enabled) 
             return $this->setIsTrial(false);
             
         $primary_invoice = $this->recurring_invoice
@@ -223,7 +223,7 @@ class ProRata extends AbstractService
                             ->orderBy('id', 'asc')
                             ->first();
     
-        if($primary_invoice && Carbon::parse($primary_invoice->date)->addSeconds($this->subscription->trial_duration)->lte(now()->startOfDay()->addSeconds($primary_invoice->client->timezone_offset())))
+        if($primary_invoice && Carbon::parse($primary_invoice->date)->addSeconds($this->recurring_invoice->subscription->trial_duration)->lte(now()->startOfDay()->addSeconds($primary_invoice->client->timezone_offset())))
             return $this->setIsTrial(true);
 
         $this->setIsTrial(false);
diff --git a/app/Services/Subscription/SubscriptionStatus.php b/app/Services/Subscription/SubscriptionStatus.php
new file mode 100644
index 000000000000..e59bb51c8303
--- /dev/null
+++ b/app/Services/Subscription/SubscriptionStatus.php
@@ -0,0 +1,169 @@
+<?php
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2023. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://www.elastic.co/licensing/elastic-license
+ */
+
+namespace App\Services\Subscription;
+
+use App\Models\Invoice;
+use App\Models\Subscription;
+use Illuminate\Support\Carbon;
+use App\Models\RecurringInvoice;
+use App\Services\AbstractService;
+
+class SubscriptionStatus extends AbstractService
+{
+    public function __construct(public Subscription $subscription, protected RecurringInvoice $recurring_invoice) {}
+    
+    /** @var bool $is_trial */
+    public bool $is_trial = false;
+    
+    /** @var bool $is_refundable */
+    public bool $is_refundable = false;
+    
+    /** @var bool $is_in_good_standing */
+    public bool $is_in_good_standing = false;
+
+    public function run(): self
+    {
+        $this->checkTrial()
+            ->checkRefundable()
+            ->checkInGoodStanding();
+
+        return $this;
+    }
+    
+    public function getProRataRatio():float
+    {
+        //calculate how much used.
+
+        $primary_invoice = $this->recurring_invoice
+                                ->invoices()
+                                ->where('is_deleted', 0)
+                                ->where('is_proforma', 0)
+                                ->orderBy('id', 'desc')
+                                ->first();
+
+        if(!$primary_invoice)
+            return 0;
+        
+        $subscription_start_date = Carbon::parse($primary_invoice->date)->startOfDay();
+        $subscription_interval_end_date = Carbon::parse($this->recurring_invoice->next_send_date_client);
+
+        $seconds_of_subscription_used = $subscription_start_date->diffInDays(now());
+        $total_seconds_in_subscription_interval = $subscription_start_date->diffInDays($subscription_interval_end_date);
+
+        return $seconds_of_subscription_used / $total_seconds_in_subscription_interval;
+
+    }
+
+    /**
+     * checkInGoodStanding
+     *
+     * @return self
+     */
+    private function checkInGoodStanding(): self
+    {
+
+        $this->is_in_good_standing = $this->recurring_invoice
+                                     ->invoices()
+                                     ->where('is_deleted', 0)
+                                     ->where('is_proform', 0)
+                                     ->whereIn('status_id', [Invoice::STATUS_SENT, Invoice::STATUS_PAID])
+                                     ->where('balance', '>', 0)
+                                     ->doesntExist();
+
+        return $this;
+
+    }
+    
+    /**
+     * checkTrial
+     *
+     * @return self
+     */
+    private function checkTrial(): self
+    {
+
+        if(!$this->subscription->trial_enabled)
+            $this->setIsTrial(false);
+
+        $primary_invoice = $this->recurring_invoice
+                            ->invoices()
+                            ->where('is_deleted', 0)
+                            ->where('is_proforma', 0)
+                            ->orderBy('id', 'asc')
+                            ->first();
+
+        if($primary_invoice && Carbon::parse($primary_invoice->date)->addSeconds($this->subscription->trial_duration)->lte(now()->startOfDay()->addSeconds($primary_invoice->client->timezone_offset()))) {
+                return $this->setIsTrial(true);
+        }
+
+        $this->setIsTrial(false);
+
+        return $this;
+
+    }
+
+    /**
+     * Determines if this subscription
+     * is eligible for a refund.
+     *
+     * @return self
+     */
+    private function checkRefundable(): self
+    {
+        if(!$this->recurring_invoice->subscription->refund_period || $this->recurring_invoice->subscription->refund_period === 0)
+            return $this->setRefundable(false);
+    
+        $primary_invoice = $this->recurring_invoice
+                                ->invoices()
+                                ->where('is_deleted', 0)
+                                ->where('is_proforma', 0)
+                                ->orderBy('id', 'desc')
+                                ->first();
+
+        if($primary_invoice &&
+        $primary_invoice->status_id == Invoice::STATUS_PAID &&
+        Carbon::parse($primary_invoice->date)->addSeconds($this->recurring_invoice->subscription->refund_period)->lte(now()->startOfDay()->addSeconds($primary_invoice->client->timezone_offset()))
+        ){
+            return $this->setRefundable(true);
+        }
+
+        return $this->setRefundable(false);
+
+    }
+
+    /**
+     * setRefundable
+     *
+     * @param  bool $refundable
+     * @return self
+     */
+    private function setRefundable(bool $refundable): self
+    {
+        $this->is_refundable = $refundable;
+
+        return $this;
+    }
+
+    /**
+     * Sets the is_trial flag
+     *
+     * @param  bool $is_trial
+     * @return self
+     */
+    private function setIsTrial(bool $is_trial): self
+    {
+        $this->is_trial = $is_trial;
+
+        return $this;
+    }
+
+}
diff --git a/app/Services/Subscription/UpgradePrice.php b/app/Services/Subscription/UpgradePrice.php
new file mode 100644
index 000000000000..cca93953e3f8
--- /dev/null
+++ b/app/Services/Subscription/UpgradePrice.php
@@ -0,0 +1,91 @@
+<?php
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2023. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://www.elastic.co/licensing/elastic-license
+ */
+
+namespace App\Services\Subscription;
+
+use App\Models\Credit;
+use App\Models\Invoice;
+use App\Models\Subscription;
+use App\Models\RecurringInvoice;
+use App\Services\AbstractService;
+
+class UpgradePrice extends AbstractService
+{    
+    protected \App\Services\Subscription\SubscriptionStatus $status;
+
+    public function __construct(protected RecurringInvoice $recurring_invoice, public Subscription $subscription)
+    {
+    }
+
+    public function run(): float
+    {
+
+        $this->status = $this->recurring_invoice
+                       ->subscription
+                       ->status($this->recurring_invoice);
+
+        if($this->status->is_trial || !$this->status->is_in_good_standing)
+            return $this->subscription->price; 
+
+        if($this->status->is_in_good_standing)
+            return $this->calculateUpgrade();
+        
+    }
+
+    private function calculateUpgrade(): float
+    {
+        $ratio = $this->status->getProRataRatio();
+
+        $last_invoice = $this->recurring_invoice
+                             ->invoices()
+                             ->where('is_deleted', 0)
+                             ->where('is_proforma', 0)
+                             ->orderBy('id', 'desc')
+                             ->first();
+        
+        $refund = $this->getRefundableAmount($last_invoice, $ratio);
+        $outstanding_credit = $this->getCredits();
+        
+        nlog("{$this->subscription->price} - {$refund} - {$outstanding_credit}");
+
+        return $this->subscription->price - $refund - $outstanding_credit;
+
+    }
+
+    private function getRefundableAmount(?Invoice $invoice, float $ratio): float
+    {
+        if (!$invoice || !$invoice->date || $invoice->status_id != Invoice::STATUS_PAID || $ratio == 0) 
+            return 0;
+
+        return max(0, round(($invoice->paid_to_date*$ratio),2));
+    }
+
+    private function getCredits(): float
+    {
+        $outstanding_credits = 0;
+
+        $use_credit_setting = $this->recurring_invoice->client->getSetting('use_credits_payment');
+
+        if($use_credit_setting){
+            
+            $outstanding_credits = Credit::query()
+                               ->where('client_id', $this->recurring_invoice->client_id)
+                               ->whereIn('status_id', [Credit::STATUS_SENT,Credit::STATUS_PARTIAL])
+                               ->where('is_deleted', 0)
+                               ->where('balance', '>', 0)
+                               ->sum('balance');
+
+        }
+
+        return $outstanding_credits;
+    }
+    
+}
\ No newline at end of file