1 files changed, 83 insertions, 0 deletions
diff --git a/internal/billing/types.go b/internal/billing/types.go
new file mode 100644
index 0000000..24694cc
--- /dev/null
+++ b/internal/billing/types.go
@@ -0,0 +1,83 @@
+package billing
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"aigw/internal/domain"
+)
+
+var (
+	ErrInsufficientBalance = errors.New("insufficient balance")
+	ErrStripeDisabled      = errors.New("Stripe top-ups are disabled")
+	ErrInvalidAmount       = errors.New("invalid amount")
+	ErrQuotaExceeded       = errors.New("monthly spend quota exceeded")
+)
+
+type Meter interface {
+	Authorize(context.Context, Authorization) error
+	Settle(context.Context, domain.UsageEvent) error
+}
+
+type Authorization struct {
+	RequestID string
+	Principal domain.Principal
+	Model     domain.Model
+	Body      []byte
+	Policy    domain.LimitPolicy
+}
+
+type Options struct {
+	DatabaseURL            string
+	Currency               string
+	DefaultMaxOutputTokens int64
+	MinTopUpMinor          int64
+	MaxTopUpMinor          int64
+	StripeEnabled          bool
+	StripeAPIKey           string
+	StripeWebhookSecret    string
+	StripeSuccessURL       string
+	StripeCancelURL        string
+}
+
+type Account struct {
+	TenantID        string    `json:"tenant_id"`
+	TenantName      string    `json:"tenant_name"`
+	Currency        string    `json:"currency"`
+	BalanceMicros   int64     `json:"balance_micros"`
+	ReservedMicros  int64     `json:"reserved_micros"`
+	AvailableMicros int64     `json:"available_micros"`
+	UpdatedAt       time.Time `json:"updated_at"`
+}
+
+type LedgerEntry struct {
+	ID                 string    `json:"id"`
+	TenantID           string    `json:"tenant_id"`
+	ProjectID          string    `json:"project_id,omitempty"`
+	Currency           string    `json:"currency"`
+	AmountMicros       int64     `json:"amount_micros"`
+	BalanceAfterMicros int64     `json:"balance_after_micros"`
+	Kind               string    `json:"kind"`
+	SourceType         string    `json:"source_type"`
+	SourceID           string    `json:"source_id"`
+	Description        string    `json:"description"`
+	CreatedAt          time.Time `json:"created_at"`
+}
+
+type AdjustmentInput struct {
+	TenantID     string `json:"tenant_id"`
+	AmountMicros int64  `json:"amount_micros"`
+	Description  string `json:"description"`
+}
+
+type CheckoutInput struct {
+	TenantID    string `json:"tenant_id"`
+	AmountMinor int64  `json:"amount_minor"`
+}
+
+type CheckoutResult struct {
+	OrderID   string `json:"order_id"`
+	SessionID string `json:"session_id"`
+	URL       string `json:"url"`
+}