Power Query API with BodyRequest

Hello!

I am trying to move a functioning API from Postman into Power Query. The issue is I do not know how to convert the x-www-form-urlencoded Body value to a Power Query accepted BodyRequest. The API requires a template be submitted in the request which allows you to customize the export format of your data. Export templates are based on Freemarker language. I understand how to write the template and I have already successfully done so in Postman, but it doesn't seem like there is a way to submit a template in Power Query. Below is my current code that returns a response code of 410 and response message "No Template Submitted."

let
Description = "requestJobDescription={
""type"":""file"",
""credentials"":{
""partnerUserID"":""XXXXXXXXXXXXXXXX"",
""partnerUserSecret"":""XXXXXXXXXXXXXXXXXXXXXXXXXXXXX""
},
""onReceive"":{
""immediateResponse"":[""returnRandomFileName""]
},
""inputSettings"":{
""type"":""combinedReportData"",
""filters"":{
""startDate"":""2023-01-01"",
""endDate"":""2023-01-31""
}
},
""outputSettings"":{
""fileExtension"":""csv""
},
}",

BodyRequest = Uri.EscapeDataString("template=
<#if addHeader == true>
Policy ID,Policy Name,Employee Name,Email,Employee,Employee Clinic,Report ID,Report Ref,Report Name,Date Approved,Reimbursment ID,Date Reimbursed,Status,ReportLink,Merchant,Amount,Transaction Amount,Txn Date,Posted Date,Original Currency,BankRef,MCC Code,GL Account,Entity,Associated Clinic,Service,Require Service,Tag1,Tag2,CustomFieldDept,Expense Description,Transaction ID,Receipt Type,Receipt Link,<#lt>
</#if>
<#list reports as report>
<#list report.transactionList as expense>
<#if expense.modifiedMerchant?has_content>
<#assign merchant = expense.modifiedMerchant>
<#else>
<#assign merchant = expense.merchant>
</#if>
<#if expense.convertedAmount?has_content>
<#assign amount = expense.convertedAmount/100>
<#elseif expense.modifiedAmount?has_content>
<#assign amount = expense.modifiedAmount/100>
<#else>
<#assign amount = expense.amount/100>
</#if>
<#if expense.modifiedCreated?has_content>
<#assign created = expense.modifiedCreated>
<#else>
<#assign created = expense.created>
</#if>
<#if report.employeeCustomField1?has_content>
<#assign Employee = report.employeeCustomField1>
<#else>
<#assign Employee = report.accountEmail>
</#if>
<#if expense.details.posted?has_content && expense.managedCard>
<#assign postedDate = expense.details.posted?date(""yyyyMMdd"")?string(""yyyy-MM-dd"")>
<#else>
<#assign postedDate = "">
</#if>
<#if report.customField.Departments?has_content>
<#assign associatedClinic = report.customField.Departments>
<#else>
<#assign associatedClinic = expense.ntag1>
</#if>
<#if expense.category == ""Inventory"" || expense.category == ""Supplies & Materials"">
<#assign requireService = ""YES"">
<#else>
<#assign requireService = ""NO"">
</#if>
<#assign reportURL = ""https://www.expensify.com/report?param={%22pageReportID%22:%22"" + report.reportID + ""%22}"">
${report.policyID},<#t>
${report.policyName},<#t>
${report.employeeCustomField1},<#t>
${report.accountEmail},<#t>
${Employee},<#t>
${report.employeeCustomField2},<#t>
${report.reportID},<#t>
${report.oldReportID},<#t>
${report.reportName},<#t>
${report.approved},<#t>
${report.entryID},<#t>
${report.reimbursed},<#t>
${report.status},<#t>
${reportURL},<#t>
${merchant},<#t>
${(expense.amount/100)?string(""0.00"")},<#t>
${amount},<#t>
${expense.created},<#t>
${postedDate},<#t>
${expense.currency},<#t>
${expense.bank},<#t>
${expense.mcc},<#t>
${expense.category},<#t>
${report.customField.Locations},<#t>
${associatedClinic},<#t>
${Service},<#t>
${requireService},<#t>
${expense.ntag1},<#t>
${expense.ntag2},<#t>
${report.customField.Departments},<#t>
${expense.comment},<#t>
${expense.transactionID},<#t>
${expense.receiptObject.type},<#t>
${expense.receiptObject.url}<#lt>
</#list>
</#list>
"
),

RelativePathString = "/Integration-Server/ExpensifyIntegrations",

URLRequest = "https://integrations.expensify.com",

Request = Csv.Document(Web.Contents(URLRequest, [RelativePath=RelativePathString, Headers=[#"Content-Type"="application/x-www-form-urlencoded"], Content = Text.ToBinary(Description & BodyRequest)]))

in
Request

I would really REALLY appreciate some guidance on this as I have been stuck for a long time.

Thank you!
Mikail