What are the WhatsApp opt-in settings available for Clickatell in Vtiger CRM?

WhatsApp opt-in options are WhatsApp messaging options available for sending and receiving WhatsApp messages with Clickatell. 
You can select the following WhatsApp opt-in options for your contacts, leads, organizations, and vendors based on your preferences:

1. Single opt-in: It lets you send outgoing messages and receive incoming messages from WhatsApp using Clickatell.
2. User opted out: It lets you receive incoming messages and does not let you send outgoing messages from WhatsApp using Clickatell.
3. None:  It lets you send outgoing messages and receive incoming messages from WhatsApp using Clickatell.

The WhatsApp opt-in is a field available in a few CRM module records under Basic Information > WhatsApp opt-in in the Summary View and Detailed View. It provides WhatsApp opt-in options.
 The WhatsApp opt-in options are available for the following modules:

• Contacts
• Leads
• Organization
• Vendors

Follow these steps to select a WhatsApp opt-in option while creating or editing a record for a contact, lead, organization, or vendor:
For example, we have considered the Contacts module. , you can go to any module mentioned above.
Follow these steps to select a WhatsApp opt-in option for a contact record: 

1. Log into your CRM account.
2. Click the User Menu.
3. Click Essentials.
4. Look for Lead & Contact Management.
5. Select Contacts.
6. Click +Add Contact.

or

7. Select a Contact record.
8. Go to the Summary View or Detailed View of the record.
9. Go to Basic Information.
10. Look for the WhatsApp opt-in field. Select a suitable WhatsApp opt-in option.

You have now successfully selected a WhatsApp opt-in option for a contact in CRM.
Note: The WhatsApp opt-in options are available for all the WhatsApp providers Vtiger CRM is integrated with.