From bbb2f91cbe2c9c3b8fc8e7bf53c7240c2f831e41 Mon Sep 17 00:00:00 2001
From: Stephen Young <stephen@customer.io>
Date: Fri, 24 Jul 2026 15:24:11 -0400
Subject: [PATCH 1/2] drop from

---
 lib/api/requests.ts | 2 --
 test/api.ts         | 2 --
 2 files changed, 4 deletions(-)

diff --git a/lib/api/requests.ts b/lib/api/requests.ts
index d7f7d3c..fddc14d 100644
--- a/lib/api/requests.ts
+++ b/lib/api/requests.ts
@@ -295,7 +295,6 @@ export type SendWhatsAppRequestRequiredOptions = {
 
 export type SendWhatsAppRequestOptionalOptions = Partial<{
   to: string;
-  from: string;
   tracked: boolean;
   disable_message_retention: boolean;
   send_to_unsubscribed: boolean;
@@ -309,7 +308,6 @@ export type SendWhatsAppRequestOptions = SendWhatsAppRequestRequiredOptions & Se
 
 const WHATSAPP_OPTIONAL_KEYS = [
   'to',
-  'from',
   'tracked',
   'disable_message_retention',
   'send_to_unsubscribed',
diff --git a/test/api.ts b/test/api.ts
index 1a740a9..45539d9 100644
--- a/test/api.ts
+++ b/test/api.ts
@@ -678,7 +678,6 @@ test('#sendWhatsApp: with optional parameters: success', (t) => {
   sinon.stub(t.context.client.request, 'post');
   let req = new SendWhatsAppRequest({
     to: '+1234567890',
-    from: '+1987654321',
     identifiers: { id: '2' },
     transactional_message_id: 1,
     message_data: { key: 'value' },
@@ -693,7 +692,6 @@ test('#sendWhatsApp: with optional parameters: success', (t) => {
   t.truthy((t.context.client.request.post as SinonStub).calledWith(`${RegionUS.apiUrl}/send/whatsapp`, req.message));
   t.is(req.message.transactional_message_id, 1);
   t.is(req.message.to, '+1234567890');
-  t.is(req.message.from, '+1987654321');
   t.deepEqual(req.message.message_data, { key: 'value' });
   t.true(req.message.tracked);
   t.true(req.message.disable_message_retention);

From 0abbc818a455eaa090d8e21d27df36940fb65a22 Mon Sep 17 00:00:00 2001
From: Stephen Young <stephen@customer.io>
Date: Fri, 24 Jul 2026 16:24:19 -0400
Subject: [PATCH 2/2] Remove from from WhatsApp docs example

---
 docs/app.md | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/docs/app.md b/docs/app.md
index 84c5128..a7a8025 100644
--- a/docs/app.md
+++ b/docs/app.md
@@ -90,7 +90,7 @@ Create a new `SendWhatsAppRequest` object containing:
 
 - `transactional_message_id`: the ID or trigger name of the transactional message you want to send.
 - an `identifiers` object containing the `id` or `email` of your recipient. If the profile does not exist, Customer.io will create it.
-- `to` and `from`: E.164-formatted phone numbers. Both are optional only when the referenced `transactional_message_id` already defines them.
+- `to`: an E.164-formatted phone number. Optional only when the referenced `transactional_message_id` already defines it.
 
 Use `sendWhatsApp` referencing your request to send a transactional message. [Learn more about transactional messages](https://customer.io/docs/transactional-api).
 
@@ -100,7 +100,6 @@ const api = new APIClient("app-key", { region: RegionUS });
 
 const request = new SendWhatsAppRequest({
   to: "+15558675309",
-  from: "+15551234567",
   transactional_message_id: "3",
   message_data: {
     name: "Person",