The CSR value must be converted to a single line value.
Replace line-breaks with\n.
curl --location --request POST 'https://oteapi.webnic.cc/ssl/v2/csr/decode' \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data-raw '{
"csr": "-----BEGIN NEW CERTIFICATE REQUEST-----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\nILav8m5IroytXTR8b7xWofdQ0rY=\n-----END NEW CERTIFICATE REQUEST-----"
}'{
"code": "1000",
"message": "Command completed successfully.",
"data": {
"country": "my",
"commonName": "webnic.sbs",
"organizationName": "Qinetics Solutions Sdn Bhd",
"organizationUnit": "IT",
"locality": "KL",
"state": "KL",
"hashalgorithm": "sha256WithRSAEncryption",
"sanfield": [
"sub1.webnic.sbs"
],
"md5hash": "B0142CB9AC32AD5ACD3037865A946ADB",
"sha256hash": "297ED35EF5A1EF4995331E0DB6C85D9BABAEC671042CA5CC149F61BACCD168A7"
}
}