Once the correct phone numbers are configured on your account, your customers will be able to send that phone number a text message, which will then be passed on to you in a JSON format. SAP Live Link 365 has two ways to provide these messages:
Callbacks: You can configure a callback on your account, where you will setup a service listening for incoming HTTP requests. We will send you the incoming message as soon as it comes into our service. For more information, see our “Callbacks” technical blog
API GET requests: You can search incoming messages that have come in over a period of time using the https://livelink.sapmobileservies.com/v2/sms/mo This will retrieve a list of messages using the same JSON format as the callbacks listed above.
Refer the SMS Messaging API V2 ->GET /v2/sms/mo section in the API reference for more details.