Power Query API with BodyRequest

Yes, that is the relevant link to the API documentation. I pasted the cURL command below that I am using in Postman without any issues.

curl --location -g --request POST 'https://integrations.expensify.com/Integration-Server/ExpensifyIntegrations?requestJobDescription={
"type": "file",
"credentials": {
"partnerUserID": "XXXXXXXXXXXXXXX",
"partnerUserSecret": "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
},
"onReceive": {
"immediateResponse": ["returnRandomFileName"]
},
"inputSettings": {
"type": "combinedReportData",
"filters": {
"startDate": "2022-01-01"
}
},
"outputSettings": {
"fileExtension": "csv"
}}' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode '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>
<#if expense.tag?contains("Retail Products")>
<#assign Service = "Retail Products">
<#elseif expense.tag?contains("Injectables")>
<#assign Service = "Injectables">
<#elseif expense.tag?contains("Energy Devices")>
<#assign Service = "Energy Devices">
<#elseif expense.tag?contains("Surgical")>
<#assign Service = "Surgical">
<#elseif expense.tag?contains("Dermatology")>
<#assign Service = "Dermatology">
<#elseif expense.tag?contains("Other Clinical")>
<#assign Service = "Other Clinical">
<#elseif expense.tag?contains("Other Non-Clinical")>
<#assign Service = "Other Non-Clinical">
<#else>
<#assign Service = "No Value">
</#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>'