Send HTTP Request Plug-in - issue with httpPostWithResponseWithKeystoreConstant

When using the httppostwithresponsewithkeystoreconstant function to invoke a REST API call, we are seeing the param name-value pairs being sent in the body instead of as request parameters. This is causing an error response in the API invocation. Is there something we are setting incorrectly in the function?

httppostwithresponsewithkeystoreconstant(
"https://apidev.test.com:8443/Azure/1.0/api/data/v8.1/opportunities",
cons!API_APPIAN_JKS_ENCODED,
"appiankeystorescs",
null,
null,
{"$select", "$filter"},
{"bd_dealtype,bd_status,description,name,opportunityid", "opportunityid eq 90d1e31d-ffcc-e611-80e3-c4346bac4ed4"},
{"apiKey", "Authorization"},
{"l7xx0e6c30e3c82e41b892c293142cf15246", "Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsIng1dCI6ImEzUU4wQlpTN3M0bk4tQmRyamJGMFlfTGRNTSIsImtpZCI6ImEzUU4wQlpTN3M0bk4tQmRyamJGMFlfTGRNTSJ9.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.h5dDhpqSyBsD3lJgCwbkkfgXmerx7hhy81AT00BwaqT86W1hd8U8PXv2ywryP8APa6pM3IznNnQVeFNusl2Hx_wzV-rIxDQbyaT3QeCO_C9g4iVZnTKxvxr5AuCJd4iqWb9naN2e1lBEu_t-NFzGpC0G6D3-Tm-f-IZ2jviDzy0h1vP6l4cjBigHpagdF-aHi77xVVgcYMz_PD3ijNuB1V0SpmPgFEeD2Uy7t3GXATcziRd3fLO8N2hoHvS9EOMISaedoRBAWX2KmSfO9PiDAuhHTMuQm86GQOYjXH6eKb8H03-KTheuYouFgsR8sSmGxEdKCW_JiXv2i4poxPoUgA"},
null,
5,
10
)