Private/Get-SFHeader.ps1

function Get-SFHeader {
    [CmdletBinding()]
    [OutputType([hashtable])]
    param ()

    Assert-SFAccessToken
    return @{
        Authorization  = "Bearer $($Script:AccessToken)"
        'Content-Type' = 'application/json;charset=utf-8'
        Accept         = 'application/json;charset=utf-8'
    }
}