diff --git a/src/api/dto/sendMessage.dto.ts b/src/api/dto/sendMessage.dto.ts
index c1f16aec..1c9b1154 100644
--- a/src/api/dto/sendMessage.dto.ts
+++ b/src/api/dto/sendMessage.dto.ts
@@ -94,15 +94,21 @@ export class SendAudioDto extends Metadata {
   audio: string;
 }
 
-export type TypeButton = 'reply' | 'copy' | 'url' | 'call';
+export type TypeButton = 'reply' | 'copy' | 'url' | 'call' | 'pix';
+
+export type KeyType = 'phone' | 'email' | 'cpf' | 'cnpj' | 'random';
 
 export class Button {
   type: TypeButton;
-  displayText: string;
+  displayText?: string;
   id?: string;
   url?: string;
   copyCode?: string;
   phoneNumber?: string;
+  currency?: string;
+  name?: string;
+  keyType?: KeyType;
+  key?: string;
 }
 
 export class SendButtonsDto extends Metadata {
diff --git a/src/api/integrations/channel/whatsapp/whatsapp.baileys.service.ts b/src/api/integrations/channel/whatsapp/whatsapp.baileys.service.ts
index 87046996..8a9b03df 100644
--- a/src/api/integrations/channel/whatsapp/whatsapp.baileys.service.ts
+++ b/src/api/integrations/channel/whatsapp/whatsapp.baileys.service.ts
@@ -33,6 +33,7 @@ import { HandleLabelDto, LabelDto } from '@api/dto/label.dto';
 import {
   Button,
   ContactMessage,
+  KeyType,
   MediaMessage,
   Options,
   SendAudioDto,
@@ -1408,12 +1409,12 @@ export class BaileysStartupService extends ChannelStartupService {
             });
 
           const existingChat = await this.prismaRepository.chat.findFirst({
-            where: { instanceId: this.instanceId, remoteJid: message.key.remoteJid },
+            where: { instanceId: this.instanceId, remoteJid: message.remoteJid },
           });
 
           if (!!existingChat) {
             const chatToInsert = {
-              remoteJid: message.key.remoteJid,
+              remoteJid: message.remoteJid,
               instanceId: this.instanceId,
               name: message.pushName || '',
               unreadMessages: 0,
@@ -2831,6 +2832,15 @@ export class BaileysStartupService extends ChannelStartupService {
     );
   }
 
+  private generateRandomId(length = 11) {
+    const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+    let result = '';
+    for (let i = 0; i < length; i++) {
+      result += characters.charAt(Math.floor(Math.random() * characters.length));
+    }
+    return result;
+  }
+
   private toJSONString(button: Button): string {
     const toString = (obj: any) => JSON.stringify(obj);
 
@@ -2844,6 +2854,49 @@ export class BaileysStartupService extends ChannelStartupService {
           url: button.url,
           merchant_url: button.url,
         }),
+      pix: () =>
+        toString({
+          currency: button.currency,
+          total_amount: {
+            value: 0,
+            offset: 100
+          },
+          reference_id: this.generateRandomId(),
+          type: "physical-goods",
+          order: {
+            status: "pending",
+            subtotal: {
+              value: 0,
+              offset: 100
+            },
+            order_type: "ORDER",
+            items: [
+              {
+                name: "",
+                amount: {
+                  value: 0,
+                  offset: 100
+                },
+                quantity: 0,
+                sale_amount: {
+                  value: 0,
+                  offset: 100
+                }
+              }
+            ]
+          },
+          payment_settings: [
+            {
+              type: "pix_static_code",
+              pix_static_code: {
+                merchant_name: button.name,
+                key: button.key,
+                key_type: this.mapKeyType.get(button.keyType)
+              }
+            }
+          ],
+          share_payment_status: false
+        }),
     };
 
     return json[button.type]?.() || '';
@@ -2854,9 +2907,73 @@ export class BaileysStartupService extends ChannelStartupService {
     ['copy', 'cta_copy'],
     ['url', 'cta_url'],
     ['call', 'cta_call'],
+    ['pix', 'payment_info'],
+  ]);
+
+  private readonly mapKeyType = new Map<KeyType, string>([
+    ['phone', 'PHONE'],
+    ['email', 'EMAIL'],
+    ['cpf', 'CPF'],
+    ['cnpj', 'CNPJ'],
+    ['random', 'EVP'],
   ]);
 
   public async buttonMessage(data: SendButtonsDto) {
+    if (data.buttons.length === 0) {
+      throw new BadRequestException('At least one button is required');
+    }
+
+    const hasReplyButtons = data.buttons.some(btn => btn.type === 'reply');
+    
+    const hasPixButton = data.buttons.some(btn => btn.type === 'pix');
+    
+    const hasOtherButtons = data.buttons.some(btn => btn.type !== 'reply' && btn.type !== 'pix');
+
+    if (hasReplyButtons) {
+      if (data.buttons.length > 3) {
+        throw new BadRequestException('Maximum of 3 reply buttons allowed');
+      }
+      if (hasOtherButtons) {
+        throw new BadRequestException('Reply buttons cannot be mixed with other button types');
+      }
+    }
+
+    if (hasPixButton) {
+      if (data.buttons.length > 1) {
+        throw new BadRequestException('Only one PIX button is allowed');
+      }
+      if (hasOtherButtons) {
+        throw new BadRequestException('PIX button cannot be mixed with other button types');
+      }
+
+      const message: proto.IMessage = {
+        viewOnceMessage: {
+          message: {
+            interactiveMessage: {
+              nativeFlowMessage: {
+                buttons: [{
+                  name: this.mapType.get('pix'),
+                  buttonParamsJson: this.toJSONString(data.buttons[0]),
+                }],
+                messageParamsJson: JSON.stringify({
+                  from: 'api',
+                  templateId: v4(),
+                }),
+              },
+            },
+          },
+        },
+      };
+
+      return await this.sendMessageWithTyping(data.number, message, {
+        delay: data?.delay,
+        presence: 'composing',
+        quoted: data?.quoted,
+        mentionsEveryOne: data?.mentionsEveryOne,
+        mentioned: data?.mentioned,
+      });
+    }
+
     const generate = await (async () => {
       if (data?.thumbnailUrl) {
         return await this.prepareMediaMessage({
diff --git a/src/validate/message.schema.ts b/src/validate/message.schema.ts
index afb4046a..d514c619 100644
--- a/src/validate/message.schema.ts
+++ b/src/validate/message.schema.ts
@@ -413,14 +413,18 @@ export const buttonsMessageSchema: JSONSchema7 = {
         properties: {
           type: {
             type: 'string',
-            enum: ['reply', 'copy', 'url', 'call'],
+            enum: ['reply', 'copy', 'url', 'call', 'pix'],
           },
           displayText: { type: 'string' },
           id: { type: 'string' },
           url: { type: 'string' },
           phoneNumber: { type: 'string' },
+          currency: { type: 'string' },
+          name: { type: 'string' },
+          keyType: { type: 'string', enum: ['phone', 'email', 'cpf', 'cnpj', 'random'] },
+          key: { type: 'string' },
         },
-        required: ['type', 'displayText'],
+        required: ['type'],
         ...isNotEmpty('id', 'url', 'phoneNumber'),
       },
     },