Windows curl Batch file

Question

I want to make a mailgun curl call using windows batch file. Since windows shell doesn't support multiple lines, how can I execute the below curl function in windows batch file?

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curl -s --user 'api:key-xxxxxxxxxx' \
    https://api.mailgun.net/v3/sandboxbxxxxxxxxxxxxx.mailgun.org/messages \
    -F from='user <email@gmail.com>' \
    -F to='user <email@live.com>' \
    -F subject='Hello' \
    -F text='body!' \
    -F attachment=@test.txt \

Update

When I tried to execute the command after removing the multiple lines it returned this error:

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    curl -s --user 'api:key-xxxxxxxxxx' https://api.mailgun.net/v3/sandboxbxxxxxxxxxxxxx.mailgun.org/messages -F from='user  -F to='user  -F subject='Hello' -F text='body!' -F attachment=@test.txt 0<email@live.com 1>'
The system cannot find the file specified.

PS: The attachment file is in the same directory

Thanks!

Answer 1

simply on one line and put the <> redirection char between " or escape it with ^:

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curl -s --user 'api:key-xxxxxxxxxx' https://api.mailgun.net/v3/sandboxbxxxxxxxxxxxxx.mailgun.org/messages -F from="user <email@gmail.com>" -F to="user <email@live.com>" -F subject='Hello' -F text='body!' -F attachment=@test.txt

You can also create variable for each element :

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set "$ApiKey=api:key-xxxxxxxxxx"
set "$Url=https://api.mailgun.net/v3/sandboxbxxxxxxxxxxxxx.mailgun.org/messages"
set "$From=email@gmail.com"
....

and then 

curl -s --user '%$ApiKey%' %$Url% -F from="user <%$From%>" -F to= ....