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Need help with integration

Hi All,
Anybody out there who can help with API calls/integration requirement in my project. I am new to integration requirements so looking for help. Below is my requirement.
I have Opportunity object where i need to place a button 'SendRequest'. When user clicks on this button i need to validate some matching criteria. If criteria met then i need to send request with few fields info like opportunity type,stage, createddate to external system and update few fileds on opportunity upon receiving response.

Please help me to achieve this task.
Thanks In Advance.
David EntremontDavid Entremont
Are you in Lightning or Classic? I'm tempted to answer for Lightning but want to be sure.