When you are sending the $subscription back to Stripe I imagine it needs to be encoded as JSON - from your script it looks like you are sending a perl data structure.

You will also need to set the "content-type" header to "application/json" and use the request() method instead of post_form() as the latter only sends "application/x-www-form-urlencoded" (at least that what the docs seem to be saying) 

my $subscription = {
        'items[0][id]'                 => 'x',
        'items[0][price]'              => 'some price',
};

my $options = {
    'headers' => {
        'Authorization' => 'Bearer ' . $Site::Variables::stripe_secret
+,
        'content-type'  => 'application/json',
    },
    'content' => encode_json($subscription),
};

my $response = $http->request('POST', "https://api.stripe.com/v1/subsc
+riptions/$sub_id", $options);

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In reply to Re: HTTP::Tiny losing headers for Stripe by tangent
in thread HTTP::Tiny losing headers for Stripe by Bod

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