Bump Stripe.net from 47.4.0 to 48.0.2 and fix breaking API changes

[Copilot]

This PR updates the Stripe.net package from version 47.4.0 to 48.0.2 and addresses the breaking changes introduced in the new version.

Key Changes

Package Update

• Updated Stripe.net from 47.4.0 to 48.0.2 in Exceptionless.Core.csproj

Breaking Changes Fixed

1. Invoice Line Item Processing
The deprecated Plan property on invoice line items has been replaced with the Price object:

// Before (v47.4.0)
if (line.Plan is not null)
{
    string planName = line.Plan.Nickname ?? _billingManager.GetBillingPlan(line.Plan.Id)?.Name ?? line.Plan.Id;
    item.Description = $"Exceptionless - {planName} Plan ({(line.Plan.Amount / 100.0):c}/{line.Plan.Interval})";
}

// After (v48.0.2)
if (line.Price is not null)
{
    string planName = line.Price.Nickname ?? _billingManager.GetBillingPlan(line.Price.Id)?.Name ?? line.Price.Id;
    var intervalText = line.Price.Recurring?.Interval ?? "one-time";
    var priceAmount = line.Price.UnitAmount.HasValue ? (line.Price.UnitAmount.Value / 100.0) : 0.0;
    item.Description = $"Exceptionless - {planName} Plan ({priceAmount:c}/{intervalText})";
}

2. Customer and Subscription Creation
The Plan property has been removed from CustomerCreateOptions. Subscriptions must now be created separately using the Prices API:

// Before: Plan was included in customer creation
var createCustomer = new CustomerCreateOptions
{
    Source = stripeToken,
    Plan = planId,  // This property no longer exists
    Description = organization.Name,
    Email = CurrentUser.EmailAddress
};

// After: Create customer and subscription separately
var createCustomer = new CustomerCreateOptions
{
    Source = stripeToken,
    Description = organization.Name,
    Email = CurrentUser.EmailAddress
};
var customer = await customerService.CreateAsync(createCustomer);

var subscriptionCreateOptions = new SubscriptionCreateOptions
{
    Customer = customer.Id,
    Items = new List<SubscriptionItemOptions> { new SubscriptionItemOptions { Price = planId } }
};
await subscriptionService.CreateAsync(subscriptionCreateOptions);

3. Subscription Updates
SubscriptionItemOptions now uses Price instead of Plan:

// Before
update.Items.Add(new SubscriptionItemOptions { Id = subscription.Items.Data[0].Id, Plan = planId });

// After  
update.Items.Add(new SubscriptionItemOptions { Id = subscription.Items.Data[0].Id, Price = planId });

4. Compatibility Fixes

• Added null handling for Price.UnitAmount which can be null for metered pricing models
• Replaced C# 12 collection expressions with traditional List initialization for broader compatibility

Background

Stripe.net v48 introduced breaking changes as part of Stripe's migration from the deprecated Plans API to the modern Prices API. The Plans API was officially deprecated by Stripe and replaced with a more flexible Prices API that better supports various pricing models.

These changes ensure that the billing functionality continues to work correctly with the updated Stripe.net library while maintaining the same external behavior for users.

Fixes #1937.

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✅ niemyjski
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[niemyjski]

@copilot the build is failing because you didn't fully implement the changes.

[Copilot]

@copilot the build is failing because you didn't fully implement the changes.

I've completed the missing Stripe.net v48 breaking changes implementation. The main issues were:

1. Nullable UnitAmount handling: Added null check for line.Price.UnitAmount since it can be null for metered pricing models
2. Collection expression compatibility: Replaced C# 12 collection expressions [] with traditional List<T>() initialization for broader compatibility

The changes ensure proper handling of all Stripe API breaking changes while maintaining compatibility. Fixed in commit b2479a2.

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