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I am missing messages regarding Ringcentral app. I last accessed them in December. Please contact me at (708) 429-0375 to help retrieve my messages.

You need to go use message store APIs to get the full details of your message.

First search for the messages using Get Message List API : https://developers.ringcentral.com/api-reference/Message-Store/listMessages

You will get all the sms messages list using the API. You need to give From date and To date when you are searching the messages.

example below:

https://platform.devtest.ringcentral.com/restapi/v1.0/account/~/extension/~/message-store?dateFrom=2020-01-01&dateTo=2020-09-01&page=1&perPage=100

You can see dateFrom=2020-08-01 and dateTo=2020-09-01 and it will list all the messages within this period.

Each message that will listed there will have a message id and an attachment id along with subject as you message content:

To get the message content of specific message, you can use that message id and attachment id in Get Message Content API here: https://developers.ringcentral.com/api-reference/Message-Store/readMessageContent

and you need to put that message id number and attachment number you got from there in the API to get the message content .

https://platform.devtest.ringcentral.com/restapi/v1.0/account/~/extension/~/message-store/<message id> /content/<attachment id>?contentDisposition=Inline 

example:

https://platform.devtest.ringcentral.com/restapi/v1.0/account/~/extension/~/message-store/8419061004/content/8419061004?contentDisposition=Inline