Billing Error Types (billing/errors.go)

Defines structured error and validation types for billing operations, enabling consistent error handling across invoicing and related services.

// Source: https://github.com/openmeterio/openmeter | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
// Provided via justclaw.it.com; keep this notice with the code.
package billing

import (
	"fmt"

	"github.com/openmeterio/openmeter/openmeter/app"
)

var (
	// We want to return the invoice regardless of the validation issues, as invoices can have issues at numerous
	// levels (e.g. missing default profile, missing customer override, missing billing profile, provider issues, etc.).
	//
	// We also return the validation issues. By adding codes to the validation issues, it will be easier for the clients (e.g. frontend) to handle the specific errors
	// without having to resort to string matching.
	//
	// Given that invoicing depends on the billin

... (truncated -- full source via MCP)