diff --git a/openapi/spec3.beta.sdk.json b/openapi/spec3.beta.sdk.json
index 1b0adc02..5a4ea541 100644
--- a/openapi/spec3.beta.sdk.json
+++ b/openapi/spec3.beta.sdk.json
@@ -15397,7 +15397,7 @@
             "$ref": "#/components/schemas/automatic_tax"
           },
           "billing_reason": {
-            "description": "Indicates the reason why the invoice was created. `subscription_cycle` indicates an invoice created by a subscription advancing into a new period. `subscription_create` indicates an invoice created due to creating a subscription. `subscription_update` indicates an invoice created due to updating a subscription. `subscription` is set for all old invoices to indicate either a change to a subscription or a period advancement. `manual` is set for all invoices unrelated to a subscription (for example: created via the invoice editor). The `upcoming` value is reserved for simulated invoices per the upcoming invoice endpoint. `subscription_threshold` indicates an invoice created due to a billing threshold being reached.",
+            "description": "Indicates the reason why the invoice was created.\n\n* `manual`: Unrelated to a subscription, for example, created via the invoice editor.\n* `subscription`: No longer in use. Applies to subscriptions from before May 2018 where no distinction was made between updates, cycles, and thresholds.\n* `subscription_create`: A new subscription was created.\n* `subscription_cycle`: A subscription advanced into a new period.\n* `subscription_threshold`: A subscription reached a billing threshold.\n* `subscription_update`: A subscription was updated.\n* `upcoming`: Reserved for simulated invoices, per the upcoming invoice endpoint.",
             "enum": [
               "automatic_pending_invoice_item_invoice",
               "manual",
@@ -40646,7 +40646,7 @@
             "$ref": "#/components/schemas/automatic_tax"
           },
           "billing_reason": {
-            "description": "Indicates the reason why the invoice was created. `subscription_cycle` indicates an invoice created by a subscription advancing into a new period. `subscription_create` indicates an invoice created due to creating a subscription. `subscription_update` indicates an invoice created due to updating a subscription. `subscription` is set for all old invoices to indicate either a change to a subscription or a period advancement. `manual` is set for all invoices unrelated to a subscription (for example: created via the invoice editor). The `upcoming` value is reserved for simulated invoices per the upcoming invoice endpoint. `subscription_threshold` indicates an invoice created due to a billing threshold being reached.",
+            "description": "Indicates the reason why the invoice was created.\n\n* `manual`: Unrelated to a subscription, for example, created via the invoice editor.\n* `subscription`: No longer in use. Applies to subscriptions from before May 2018 where no distinction was made between updates, cycles, and thresholds.\n* `subscription_create`: A new subscription was created.\n* `subscription_cycle`: A subscription advanced into a new period.\n* `subscription_threshold`: A subscription reached a billing threshold.\n* `subscription_update`: A subscription was updated.\n* `upcoming`: Reserved for simulated invoices, per the upcoming invoice endpoint.",
             "enum": [
               "automatic_pending_invoice_item_invoice",
               "manual",
diff --git a/openapi/spec3.beta.sdk.yaml b/openapi/spec3.beta.sdk.yaml
index 7669aeca..7accc708 100644
--- a/openapi/spec3.beta.sdk.yaml
+++ b/openapi/spec3.beta.sdk.yaml
@@ -14418,17 +14418,26 @@ components:
         billing_reason:
           description: >-
             Indicates the reason why the invoice was created.
-            `subscription_cycle` indicates an invoice created by a subscription
-            advancing into a new period. `subscription_create` indicates an
-            invoice created due to creating a subscription.
-            `subscription_update` indicates an invoice created due to updating a
-            subscription. `subscription` is set for all old invoices to indicate
-            either a change to a subscription or a period advancement. `manual`
-            is set for all invoices unrelated to a subscription (for example:
-            created via the invoice editor). The `upcoming` value is reserved
-            for simulated invoices per the upcoming invoice endpoint.
-            `subscription_threshold` indicates an invoice created due to a
-            billing threshold being reached.
+
+
+            * `manual`: Unrelated to a subscription, for example, created via
+            the invoice editor.
+
+            * `subscription`: No longer in use. Applies to subscriptions from
+            before May 2018 where no distinction was made between updates,
+            cycles, and thresholds.
+
+            * `subscription_create`: A new subscription was created.
+
+            * `subscription_cycle`: A subscription advanced into a new period.
+
+            * `subscription_threshold`: A subscription reached a billing
+            threshold.
+
+            * `subscription_update`: A subscription was updated.
+
+            * `upcoming`: Reserved for simulated invoices, per the upcoming
+            invoice endpoint.
           enum:
             - automatic_pending_invoice_item_invoice
             - manual
@@ -37395,17 +37404,26 @@ components:
         billing_reason:
           description: >-
             Indicates the reason why the invoice was created.
-            `subscription_cycle` indicates an invoice created by a subscription
-            advancing into a new period. `subscription_create` indicates an
-            invoice created due to creating a subscription.
-            `subscription_update` indicates an invoice created due to updating a
-            subscription. `subscription` is set for all old invoices to indicate
-            either a change to a subscription or a period advancement. `manual`
-            is set for all invoices unrelated to a subscription (for example:
-            created via the invoice editor). The `upcoming` value is reserved
-            for simulated invoices per the upcoming invoice endpoint.
-            `subscription_threshold` indicates an invoice created due to a
-            billing threshold being reached.
+
+
+            * `manual`: Unrelated to a subscription, for example, created via
+            the invoice editor.
+
+            * `subscription`: No longer in use. Applies to subscriptions from
+            before May 2018 where no distinction was made between updates,
+            cycles, and thresholds.
+
+            * `subscription_create`: A new subscription was created.
+
+            * `subscription_cycle`: A subscription advanced into a new period.
+
+            * `subscription_threshold`: A subscription reached a billing
+            threshold.
+
+            * `subscription_update`: A subscription was updated.
+
+            * `upcoming`: Reserved for simulated invoices, per the upcoming
+            invoice endpoint.
           enum:
             - automatic_pending_invoice_item_invoice
             - manual
diff --git a/openapi/spec3.json b/openapi/spec3.json
index 713b12da..35f7d784 100644
--- a/openapi/spec3.json
+++ b/openapi/spec3.json
@@ -11195,7 +11195,7 @@
             "$ref": "#/components/schemas/automatic_tax"
           },
           "billing_reason": {
-            "description": "Indicates the reason why the invoice was created. `subscription_cycle` indicates an invoice created by a subscription advancing into a new period. `subscription_create` indicates an invoice created due to creating a subscription. `subscription_update` indicates an invoice created due to updating a subscription. `subscription` is set for all old invoices to indicate either a change to a subscription or a period advancement. `manual` is set for all invoices unrelated to a subscription (for example: created via the invoice editor). The `upcoming` value is reserved for simulated invoices per the upcoming invoice endpoint. `subscription_threshold` indicates an invoice created due to a billing threshold being reached.",
+            "description": "Indicates the reason why the invoice was created.\n\n* `manual`: Unrelated to a subscription, for example, created via the invoice editor.\n* `subscription`: No longer in use. Applies to subscriptions from before May 2018 where no distinction was made between updates, cycles, and thresholds.\n* `subscription_create`: A new subscription was created.\n* `subscription_cycle`: A subscription advanced into a new period.\n* `subscription_threshold`: A subscription reached a billing threshold.\n* `subscription_update`: A subscription was updated.\n* `upcoming`: Reserved for simulated invoices, per the upcoming invoice endpoint.",
             "enum": [
               "automatic_pending_invoice_item_invoice",
               "manual",
diff --git a/openapi/spec3.sdk.json b/openapi/spec3.sdk.json
index 8e9d82eb..b107e122 100644
--- a/openapi/spec3.sdk.json
+++ b/openapi/spec3.sdk.json
@@ -13646,7 +13646,7 @@
             "$ref": "#/components/schemas/automatic_tax"
           },
           "billing_reason": {
-            "description": "Indicates the reason why the invoice was created. `subscription_cycle` indicates an invoice created by a subscription advancing into a new period. `subscription_create` indicates an invoice created due to creating a subscription. `subscription_update` indicates an invoice created due to updating a subscription. `subscription` is set for all old invoices to indicate either a change to a subscription or a period advancement. `manual` is set for all invoices unrelated to a subscription (for example: created via the invoice editor). The `upcoming` value is reserved for simulated invoices per the upcoming invoice endpoint. `subscription_threshold` indicates an invoice created due to a billing threshold being reached.",
+            "description": "Indicates the reason why the invoice was created.\n\n* `manual`: Unrelated to a subscription, for example, created via the invoice editor.\n* `subscription`: No longer in use. Applies to subscriptions from before May 2018 where no distinction was made between updates, cycles, and thresholds.\n* `subscription_create`: A new subscription was created.\n* `subscription_cycle`: A subscription advanced into a new period.\n* `subscription_threshold`: A subscription reached a billing threshold.\n* `subscription_update`: A subscription was updated.\n* `upcoming`: Reserved for simulated invoices, per the upcoming invoice endpoint.",
             "enum": [
               "automatic_pending_invoice_item_invoice",
               "manual",
diff --git a/openapi/spec3.sdk.yaml b/openapi/spec3.sdk.yaml
index d2b6cafa..b26645e7 100644
--- a/openapi/spec3.sdk.yaml
+++ b/openapi/spec3.sdk.yaml
@@ -12799,17 +12799,26 @@ components:
         billing_reason:
           description: >-
             Indicates the reason why the invoice was created.
-            `subscription_cycle` indicates an invoice created by a subscription
-            advancing into a new period. `subscription_create` indicates an
-            invoice created due to creating a subscription.
-            `subscription_update` indicates an invoice created due to updating a
-            subscription. `subscription` is set for all old invoices to indicate
-            either a change to a subscription or a period advancement. `manual`
-            is set for all invoices unrelated to a subscription (for example:
-            created via the invoice editor). The `upcoming` value is reserved
-            for simulated invoices per the upcoming invoice endpoint.
-            `subscription_threshold` indicates an invoice created due to a
-            billing threshold being reached.
+
+
+            * `manual`: Unrelated to a subscription, for example, created via
+            the invoice editor.
+
+            * `subscription`: No longer in use. Applies to subscriptions from
+            before May 2018 where no distinction was made between updates,
+            cycles, and thresholds.
+
+            * `subscription_create`: A new subscription was created.
+
+            * `subscription_cycle`: A subscription advanced into a new period.
+
+            * `subscription_threshold`: A subscription reached a billing
+            threshold.
+
+            * `subscription_update`: A subscription was updated.
+
+            * `upcoming`: Reserved for simulated invoices, per the upcoming
+            invoice endpoint.
           enum:
             - automatic_pending_invoice_item_invoice
             - manual
diff --git a/openapi/spec3.yaml b/openapi/spec3.yaml
index da576115..bd5a2c4a 100644
--- a/openapi/spec3.yaml
+++ b/openapi/spec3.yaml
@@ -10854,17 +10854,26 @@ components:
         billing_reason:
           description: >-
             Indicates the reason why the invoice was created.
-            `subscription_cycle` indicates an invoice created by a subscription
-            advancing into a new period. `subscription_create` indicates an
-            invoice created due to creating a subscription.
-            `subscription_update` indicates an invoice created due to updating a
-            subscription. `subscription` is set for all old invoices to indicate
-            either a change to a subscription or a period advancement. `manual`
-            is set for all invoices unrelated to a subscription (for example:
-            created via the invoice editor). The `upcoming` value is reserved
-            for simulated invoices per the upcoming invoice endpoint.
-            `subscription_threshold` indicates an invoice created due to a
-            billing threshold being reached.
+
+
+            * `manual`: Unrelated to a subscription, for example, created via
+            the invoice editor.
+
+            * `subscription`: No longer in use. Applies to subscriptions from
+            before May 2018 where no distinction was made between updates,
+            cycles, and thresholds.
+
+            * `subscription_create`: A new subscription was created.
+
+            * `subscription_cycle`: A subscription advanced into a new period.
+
+            * `subscription_threshold`: A subscription reached a billing
+            threshold.
+
+            * `subscription_update`: A subscription was updated.
+
+            * `upcoming`: Reserved for simulated invoices, per the upcoming
+            invoice endpoint.
           enum:
             - automatic_pending_invoice_item_invoice
             - manual