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Imtiaz PashaImtiaz Pasha 

hi all plz help , i have intergarted outside system with salesforce , i written callout api when i tested my data is flowing into thier system but they are not receiving it and when i tested in postman they are receiving what isd the issu here

ANUTEJANUTEJ (Salesforce Developers) 
Hi Imtiaz,

>> https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_callouts.htm

Please check if all the steps mentioned are followed and also, can you please check the response code that you are getting after making the callout.

Also, I would suggest you to check this link: https://www.mstsolutions.com/technical/apex-callouts-to-display-external-data-in-salesforce/

Let me know if it helps you and close your query by marking it as solved so that it can help others in the future.  

Thanks.