Feat(fixed_charges): Extract chargeable validation service #4109
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## Roadmap Task 👉 https://getlago.canny.io/feature-requests/p/allow-add-ons-to-be-added-to-subscription-invoices 👉 https://getlago.canny.io/feature-requests/p/define-quantities-for-plan-charges ## Context What is the current situation? **Option 1:** User has to create a one off invoice alongside the subscription, it will create 2 different invoices. **Option 2:** User can add a recurring billable metric and use event to have this fee invoice on subscription renewal, but it won’t appear on the first billing subscription. What problem are we trying to solve? At subscription creation or afterward, there is no clear way to invoice a fixed fee that is not tied to events, aside from the subscription fee itself. This fee could be either a one-time charge or a recurring one. ## Description Add `Plans::ChargeablesValidationService` to validate billable metrics and add ons for charges and fixed charges on plans creation params.
vincent-pochet
approved these changes
Aug 7, 2025
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Roadmap Task
👉 https://getlago.canny.io/feature-requests/p/allow-add-ons-to-be-added-to-subscription-invoices
👉 https://getlago.canny.io/feature-requests/p/define-quantities-for-plan-charges
Context
What is the current situation?
Option 1: User has to create a one off invoice alongside the
subscription, it will create 2 different invoices.
Option 2: User can add a recurring billable metric and use event to
have this fee invoice on subscription renewal, but it won’t appear on
the first billing subscription.
What problem are we trying to solve?
At subscription creation or afterward, there is no clear way to invoice
a fixed fee that is not tied to events, aside from the subscription fee
itself. This fee could be either a one-time charge or a recurring one.
Description
Add
Plans::ChargeablesValidationServiceto validate billable metricsand add ons for charges and fixed charges on plans creation params.