Shopify Checkout Booster app, PayPage V2 API v1.16.1, and more

June 2, 2026

New: Shopify Checkout Booster app

We have published documentation for the new Shopify Checkout Booster app (version 1.0.0, released May 2026).

The Shopify Checkout Booster is a Shopify application that enhances and extends your existing Unzer payment integration. Key capabilities include:

• Dynamic messaging widgets — display promotional messaging for available Unzer payment methods (such as Unzer Invoice and Unzer Installment) on product and cart pages to help customers understand their payment options before checkout.
• Widget setup — configure and place installment and invoice widgets on your storefront from the app settings, including choosing their position on product and cart pages.
• Payment method customization — set display names and sort order for each active Unzer payment method at checkout, and define availability conditions based on customer location, currency, and cart amount.
• Two-way synchronization — monitors external transaction updates and keeps your Shopify store and Unzer Insights in sync throughout the payment lifecycle.
• Order management — view Unzer transactions directly from Shopify order administration via More actions > View in Unzer, and trigger automatic capture when an order is fulfilled.

The documentation covers installation, widget setup, and payment method configuration. To get started, see Shopify Checkout Booster.

PayPage V2 API reference updated to version 1.16.1

The PayPage V2 API reference has been updated to version 1.16.1. This release adds the following new schemas to the API specification:

• Address — a structured address object with fields for name, street, state, ZIP code, city, country (ISO 3166-1 alpha-2), and company name.
• Basket and BasketItem — schemas for passing full basket data with the payment page request, including total value, currency, order ID, item quantities, unit prices, VAT rates, discounts, and item classification (goods, digital, shipment, or voucher).
• B2B company schemas — additions for company registration status, commercial register number, function/role, industry sector, and company owner details, enabling richer B2B payment page integrations.
• code field in error responses — error objects now include a code field alongside the existing field and message fields.

Pay Later billing CSV: shop_id and shop_name metadata keys

The Manage metadata page now includes a new Pay Later billing CSV mapping section.

For the Pay later (BNPL) payment methods — Unzer Invoice, Unzer Installment, and Unzer Direct Debit (secured) — two metadata keys are recognized and mapped to the merchant billing CSV when it is enabled:

• shop_id — the merchant shop identifier, included as a dedicated column in the billing CSV.
• shop_name — the merchant shop name, included as a dedicated column in the billing CSV.

Both keys are optional. Attach the metadata resource containing these keys to your Pay later authorize or charge call using metadataId, as you would with any other metadata resource.