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In the left rail, browse to Administration > Channels > SMS Settings and select the API Credentials menu. Click the Create new API credentials button.

Configure your SMS API credentials, as detailed below:

• SMS vendor: Twilio.

• Name: choose a name for your API Credential.

• Account SID and Auth Token: access the Account Info pane of your Twilio Console Dashboard page to find your credentials.

• Message SID: enter the unique identifier assigned to every message created by Twilio’s API. Learn more in .

• Inbound Number: add your unique inbound number. This allows you to use the same API credentials across different sandboxes, each with its own inbound number.

Click Submit when you finished the configuration of your API credentials.

In the API Credentials menu, click the bin icon to delete your API credentials.

To modify existing credentials, locate the desired API credentials and click the Edit option to make the necessary changes.

Register for RCS Messaging in Twilio

Begin by completing the RCS registration process in the Twilio platform. This includes setting up your business profile and enabling RCS capabilities for your account.

Create an SMS Webhook

Configure an SMS Webhook that can receive incoming RCS message responses or delivery updates. This webhook must be properly linked to your Twilio setup for two-way communication.

Create API Credential using Custom as SMS vendor

In Journey Optimizer, define new API credentials specifically for RCS using “Custom” as the SMS vendor. Use the appropriate RCS endpoint authentication method, base URL, and headers.