trying to post some JSON while using HTTP::Tiny. To my idea I have an okay structure of the data to post and I'm also authorised to post however I get the message 'content' => 'Cannot parse URL: \'HASH(0x7fc154e1fb50)\'.

The full code and result I see from data::Dumper is pasted below. Maybe someone can tell me what I'm doing wrong?

sub create_external_inv {
    my $headers = {
        Accept         => "application/json",
        'Content-Type' => "application/json",
        Authorization => "Bearer 123"
    };

    my $url = "https://moneybird.com/api/v2/123/external_sales_invoice
+s";

    my $data = (
        {
            external_sales_invoices => {
                "reference"          => "M-8426",
                "date"               => "2020-03-14",
                "contact_id"         => 456,
                "details_attributes" => [
                    {
                        "description" => "coffee",
                        "price"       => 2.25,
                        "tax_rate_id" => 891
                    }
                ]
            }
        }
    );

    my $agent = HTTP::Tiny->new;
    my $res =
      $agent->post( { url => $url, content => $data, headers => $heade
+rs } );

    print Dumper $res;
    if ( $res->{success} ) {
        print "Okay!\n";
    }
    else {
        print "\n\Nope...\n\n";
    }
}
[download]

The result I see in the log from my Dancer2 app

'content' => 'Cannot parse URL: \'HASH(0x7fc154e1fb50)\'
',
'url' => {
  'content' => {
    'external_sales_invoices' => {
       'reference' => 'M-8426',
       'details_attributes' => [{'tax_rate_id' => '891,
                                 'description' => 'coffee',
                                 'price' => '2.25}],
                 'date' => '2020-03-14',
                 'contact_id' => '456
                           }
                        },
           'headers' => {
                          'Content-Type' => 'application/json',
                          'Accept' => 'application/json',
                          'Authorization' => 'Bearer 123'
                        },
           'url' => 'https://moneybird.com/api/v2/123/external_sales_i
+nvoices'
         },
          'reason' => 'Internal Exception',
          'success' => '',
          'status' => 599,
          'headers' => {
                         'content-type' => 'text/plain',
                         'content-length' => 41
                       }
        };
[download]