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Imtiaz PashaImtiaz Pasha 

Hi Guys, from external system want to fetch attachment from the object Case , so i have given him this URL to post , but he cant able to get it back that attachment to his system , once someone uploaded in sf any idead how to resolve ?

Here is the URL
https://uat-mtscafe.cs74.force.com/services/apexrest/caseattach/

Body : 
{
"id":"5000p0000035qkMAAQ",
"documents": [
    {
      "fileName": "Image file
IMG_9529",
      "Content_Type": "",
      "data": "Base 64"
}
]
}
ANUTEJANUTEJ (Salesforce Developers) 
Hi Imtiaz,

As per my understanding if you are getting records from the sf org I think you will have to have a rest resource that could get the records and you could test if the flow is working or not using postman to see the response you are getting, additionally, you can use the below implementation for you reference:

>> http://amitsalesforce.blogspot.com/2017/06/test-salesforce-api-by-postman-rest.html

Let me know if this comes handy in case if it does can you please choose this as best answer so that it can be used by others in the future,

Regards.
Anutej