diff --git a/reports.go b/reports.go
index 77699a1..d789378 100644
--- a/reports.go
+++ b/reports.go
@@ -16,6 +16,13 @@ var ErrReportCreationLimitExceeded = &paddleerr.Error{
 	Type: paddleerr.ErrorTypeRequestError,
 }
 
+// ErrConcurrentReportGenerationNotAllowed represents a `concurrent_report_generation_not_allowed` error.
+// See https://developer.paddle.com/errors/reports/concurrent_report_generation_not_allowed for more information.
+var ErrConcurrentReportGenerationNotAllowed = &paddleerr.Error{
+	Code: "concurrent_report_generation_not_allowed",
+	Type: paddleerr.ErrorTypeRequestError,
+}
+
 // ErrReportNotReady represents a `report_not_ready` error.
 // See https://developer.paddle.com/errors/reports/report_not_ready for more information.
 var ErrReportNotReady = &paddleerr.Error{
diff --git a/shared.go b/shared.go
index e39776f..2e54459 100644
--- a/shared.go
+++ b/shared.go
@@ -38,6 +38,13 @@ var ErrAuthenticationMalformed = &paddleerr.Error{
 	Type: paddleerr.ErrorTypeRequestError,
 }
 
+// ErrInvalidClientToken represents a `invalid_client_token` error.
+// See https://developer.paddle.com/errors/shared/invalid_client_token for more information.
+var ErrInvalidClientToken = &paddleerr.Error{
+	Code: "invalid_client_token",
+	Type: paddleerr.ErrorTypeRequestError,
+}
+
 // ErrInvalidToken represents a `invalid_token` error.
 // See https://developer.paddle.com/errors/shared/invalid_token for more information.
 var ErrInvalidToken = &paddleerr.Error{
diff --git a/subscriptions.go b/subscriptions.go
index 1875755..4ad9b9d 100644
--- a/subscriptions.go
+++ b/subscriptions.go
@@ -366,6 +366,13 @@ var ErrSubscriptionArchivedDiscountApplicationAttempt = &paddleerr.Error{
 	Type: paddleerr.ErrorTypeRequestError,
 }
 
+// ErrSubscriptionMaximumNumberOfLineItemsReached represents a `subscription_maximum_number_of_line_items_reached` error.
+// See https://developer.paddle.com/errors/subscriptions/subscription_maximum_number_of_line_items_reached for more information.
+var ErrSubscriptionMaximumNumberOfLineItemsReached = &paddleerr.Error{
+	Code: "subscription_maximum_number_of_line_items_reached",
+	Type: paddleerr.ErrorTypeRequestError,
+}
+
 // SubscriptionStatus: Status of this subscription. Set automatically by Paddle. Use the pause subscription or cancel subscription operations to change..
 type SubscriptionStatus string
 
diff --git a/transactions.go b/transactions.go
index f78c190..4c747ee 100644
--- a/transactions.go
+++ b/transactions.go
@@ -275,6 +275,20 @@ var ErrTransactionCannotBeRevisedWithInvalidTaxIdentifier = &paddleerr.Error{
 	Type: paddleerr.ErrorTypeRequestError,
 }
 
+// ErrTransactionCannotBeRevisedWithTaxHigherThanGrandTotal represents a `transaction_cannot_be_revised_with_tax_higher_than_grand_total` error.
+// See https://developer.paddle.com/errors/transactions/transaction_cannot_be_revised_with_tax_higher_than_grand_total for more information.
+var ErrTransactionCannotBeRevisedWithTaxHigherThanGrandTotal = &paddleerr.Error{
+	Code: "transaction_cannot_be_revised_with_tax_higher_than_grand_total",
+	Type: paddleerr.ErrorTypeRequestError,
+}
+
+// ErrTransactionMaximumNumberOfLineItemsReached represents a `transaction_maximum_number_of_line_items_reached` error.
+// See https://developer.paddle.com/errors/transactions/transaction_maximum_number_of_line_items_reached for more information.
+var ErrTransactionMaximumNumberOfLineItemsReached = &paddleerr.Error{
+	Code: "transaction_maximum_number_of_line_items_reached",
+	Type: paddleerr.ErrorTypeRequestError,
+}
+
 // AdjustmentTotalsBreakdown: Breakdown of the total adjustments by adjustment action.
 type AdjustmentTotalsBreakdown struct {
 	// Credit: Total amount of credit adjustments.