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Latest Updates
May 7, 2026

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New Features

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Custom Dynamic Amount Support

Added support for custom dynamic amounts on the checkout page. You can now pass a specific custom_amount directly via the checkout API, which is ideal for usage-based, variable, or custom-quoted pricing models.
  • custom_amount: The specific numeric amount to be charged to the customer. This overrides static plan pricing and is ideal for usage-based, variable, or custom-quoted pricing models.
  • tax_behavior: Specifies how taxes should be applied to the custom amount. For example, setting it to “INCLUSIVE” means the tax is already factored into the custom_amount, while “EXCLUSIVE” would add the tax on top of the base amount.
  • currency_code: The three-letter ISO currency code (e.g., “INR”, “USD”) that defines the currency in which the custom_amount should be processed. 
{
  "planIdentifier": "automatic-pricing",
  "successUrl": "[https://www.kelviq.com/](https://www.kelviq.com/)",
  "chargePeriod": "MONTHLY",
  "customerId": "sam-altman0010",
  "custom_amount": 1200,
  "tax_behavior": "INCLUSIVE",
  "currency_code": "INR"
}
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v2.1.0
May 7, 2026

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New Features

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Enhanced Checkout Configuration

You can now pass additional configuration parameters when creating a checkout session via the API. These new fields allow for tighter control over the customer experience:
  • lockEmail: When set to true, the email address field on the checkout page is disabled, preventing customers from changing the email associated with the session.
  • discountsEnabled: A boolean to explicitly allow or disallow discount code application on the checkout page.
  • defaultBillingCountry: Pre-fills the billing country field (e.g., "IN").
Example Payload:
{
  "planIdentifier": "base",
  "successUrl": "[https://kelviq.com/checkout/success](https://kelviq.com/checkout/success)",
  "chargePeriod": "MONTHLY",
  "customerId": "sachin",
  "lockEmail": true,
  "discountsEnabled": false,
  "defaultBillingCountry": "IN"
}