Add support for the LineItem resource and APIs

.travis.yml

@@ -32,7 +32,7 @@ cache:
 env:
   global:
     # If changing this number, please also change it in `testing/testing.go`.
-    - STRIPE_MOCK_VERSION=0.89.0
+    - STRIPE_MOCK_VERSION=0.90.0
 
 go:
   - "1.10.x"

checkout/session/client.go

@@ -59,11 +59,42 @@ func (c Client) List(listParams *stripe.CheckoutSessionListParams) *Iter {
 	})}
 }
 
+// ListLineItems returns a list of line items on a session.
+func ListLineItems(params *stripe.CheckoutSessionListLineItemParams) *LineItemIter {
+	return getC().ListLineItems(params)
+}
+
+// ListLineItems returns a list of line items on a session.
+func (c Client) ListLineItems(listParams *stripe.CheckoutSessionListLineItemParams) *LineItemIter {
+	path := stripe.FormatURLPath("/v1/checkout/sessions/%s/line_items", stripe.StringValue(listParams.Session))
+	return &LineItemIter{stripe.GetIter(listParams, func(p *stripe.Params, b *form.Values) ([]interface{}, stripe.ListMeta, error) {
+		list := &stripe.LineItemList{}
+		err := c.B.CallRaw(http.MethodGet, path, c.Key, b, p, list)
+
+		ret := make([]interface{}, len(list.Data))
+		for i, v := range list.Data {
+			ret[i] = v
+		}
+
+		return ret, list.ListMeta, err
+	})}
+}
+
 // Iter is an iterator for sessions.
 type Iter struct {
 	*stripe.Iter
 }
 
+// LineItemIter is an iterator for line items on a session.
+type LineItemIter struct {
+	*stripe.Iter
+}
+
+// LineItem returns the line item which the iterator is currently pointing to.
+func (i *LineItemIter) LineItem() *stripe.LineItem {
+	return i.Current().(*stripe.LineItem)
+}
+
 // CheckoutSession returns the session which the iterator is currently pointing to.
 func (i *Iter) CheckoutSession() *stripe.CheckoutSession {
 	return i.Current().(*stripe.CheckoutSession)

checkout_session.go

@@ -36,16 +36,38 @@ const (
 	CheckoutSessionModeSubscription CheckoutSessionMode = "subscription"
 )
 
+// CheckoutSessionLineItemPriceDataRecurringParams is the set of parameters for the recurring
+// components of a price created inline for a line item
+type CheckoutSessionLineItemPriceDataRecurringParams struct {
+	AggregateUsage  *string `form:"aggregate_usage"`
+	Interval        *string `form:"interval"`
+	IntervalCount   *int64  `form:"interval_count"`
+	TrialPeriodDays *int64  `form:"trial_period_days"`
+	UsageType       *string `form:"usage_type"`
+}
+
+// CheckoutSessionLineItemPriceDataParams is a structure representing the parameters to create
+// an inline price for a line item.
+type CheckoutSessionLineItemPriceDataParams struct {
+	Currency          *string                                          `form:"currency"`
+	Product           *string                                          `form:"product"`
+	Recurring         *CheckoutSessionLineItemPriceDataRecurringParams `form:"recurring"`
+	UnitAmount        *int64                                           `form:"unit_amount"`
+	UnitAmountDecimal *float64                                         `form:"unit_amount_decimal,high_precision"`
+}
+
 // CheckoutSessionLineItemParams is the set of parameters allowed for a line item
 // on a checkout session.
 type CheckoutSessionLineItemParams struct {
-	Amount      *int64    `form:"amount"`
-	Currency    *string   `form:"currency"`
-	Description *string   `form:"description"`
-	Images      []*string `form:"images"`
-	Name        *string   `form:"name"`
-	Quantity    *int64    `form:"quantity"`
-	TaxRates    []*string `form:"tax_rates"`
+	Amount      *int64                                  `form:"amount"`
+	Currency    *string                                 `form:"currency"`
+	Description *string                                 `form:"description"`
+	Images      []*string                               `form:"images"`
+	Name        *string                                 `form:"name"`
+	Price       *string                                 `form:"price"`
+	PriceData   *CheckoutSessionLineItemPriceDataParams `form:"price_data"`
+	Quantity    *int64                                  `form:"quantity"`
+	TaxRates    []*string                               `form:"tax_rates"`
 }
 
 // CheckoutSessionPaymentIntentDataTransferDataParams is the set of parameters allowed for the
@@ -130,6 +152,13 @@ type CheckoutSessionParams struct {
 	SuccessURL                *string                                         `form:"success_url"`
 }
 
+// CheckoutSessionListLineItemParams is the set of parameters that can be
+// used when listing line items on a session.
+type CheckoutSessionListLineItemParams struct {
+	ListParams `form:"*"`
+	Session    *string `form:"-"` // Included in URL
+}
+
 // CheckoutSessionListParams is the set of parameters that can be
 // used when listing sessions.
 // For more details see: https://stripe.com/docs/api/checkout/sessions/list
@@ -174,6 +203,7 @@ type CheckoutSession struct {
 	Deleted                   bool                                      `json:"deleted"`
 	DisplayItems              []*CheckoutSessionDisplayItem             `json:"display_items"`
 	ID                        string                                    `json:"id"`
+	LineItems                 []*LineItem                               `json:"line_items"`
 	Livemode                  bool                                      `json:"livemode"`
 	Locale                    string                                    `json:"locale"`
 	Metadata                  map[string]string                         `json:"metadata"`

lineitem.go

@@ -0,0 +1,51 @@
+package stripe
+
+import (
+	"encoding/json"
+)
+
+// LineItemTax represent the details of one tax rate applied to a line item.
+type LineItemTax struct {
+	Amount  int64    `json:"amount"`
+	TaxRate *TaxRate `json:"tax_rate"`
+}
+
+// LineItem is the resource representing a line item.
+type LineItem struct {
+	APIResource
+	AmountSubtotal int64          `json:"amount_subtotal"`
+	AmountTotal    int64          `json:"amount_total"`
+	Currency       Currency       `json:"currency"`
+	Description    string         `json:"description"`
+	ID             string         `json:"id"`
+	Object         string         `json:"object"`
+	Price          *Price         `json:"price"`
+	Quantity       int64          `json:"quantity"`
+	Taxes          []*LineItemTax `json:"taxes"`
+}
+
+// LineItemList is a list of prices as returned from a list endpoint.
+type LineItemList struct {
+	APIResource
+	ListMeta
+	Data []*LineItem `json:"data"`
+}
+
+// UnmarshalJSON handles deserialization of a LineItem.
+// This custom unmarshaling is needed because the resulting
+// property may be an id or the full struct if it was expanded.
+func (s *LineItem) UnmarshalJSON(data []byte) error {
+	if id, ok := ParseID(data); ok {
+		s.ID = id
+		return nil
+	}
+
+	type price LineItem
+	var v price
+	if err := json.Unmarshal(data, &v); err != nil {
+		return err
+	}
+
+	*s = LineItem(v)
+	return nil
+}

lineitem/client.go

@@ -0,0 +1,16 @@
+// Package lineitem provides the tools needs to interact with the LineItem resource.
+package lineitem
+
+import (
+	stripe "github.com/stripe/stripe-go/v71"
+)
+
+// LineItemIter is an iterator for line items across various resources.
+type LineItemIter struct {
+	*stripe.Iter
+}
+
+// LineItem returns the line item which the iterator is currently pointing to.
+func (i *LineItemIter) LineItem() *stripe.LineItem {
+	return i.Current().(*stripe.LineItem)
+}

testing/testing.go

@@ -25,7 +25,7 @@ const (
 	// added in a more recent version of stripe-mock, we can show people a
 	// better error message instead of the test suite crashing with a bunch of
 	// confusing 404 errors or the like.
-	MockMinimumVersion = "0.89.0"
+	MockMinimumVersion = "0.90.0"
 
 	// TestMerchantID is a token that can be used to represent a merchant ID in
 	// simple tests.