Cannot create Ticket in OTRS via generic interface through Http request

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Hii everyone,
I’m trying to create ticket on OTRS but it returns 404 error,I,m using OTRS 7 free.What is the mistake

url used-https://test25June.managed-otrs.com/otrs/nph-genericinterface.pl/Webservice/GenericTicketREST/Ticket

Body-
{ “UserLogin”: “****”,

“Password”: “****”,

"Ticket" :

{ “Title”: “Testing”, “Queue”: “Raw”, “Lock”: “unlock”, “Type”: “Unclassified”, “State”: “new”, “Priority”: “3 normal”, “Owner”: “admin”, “CustomerUser”: “admin” },

“Article”: { “Subject” : “jakiś temat”, “Body” : “test test tes test”, “ContentType”: “text/plain; charset=utf8”

} }
Response
{ “ErrorCode”: 404, “Message”: “The requested resource is not found.”, “Request”: “/otrs/nph-genericinterface.pl/Webservice/GenericTicketREST/Ticket” }

I am stuck here,Please help me.

Regards,
Supriya