Returns the profile picture URL for a contact. Returns null if the contact has no picture or privacy settings block it.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
The WhatsApp instance UUID
"a1b2c3d4-e5f6-7890-abcd-ef1234567890"
Contact ID (e.g., [email protected])
Profile picture URL
Profile picture URL (null if not set)
"https://pps.whatsapp.net/..."