Client error: `POST https://treacle.cloud/oauth/token` resulted in a `400 Bad Request` response:
{"error":"invalid_request","message":"The request is missing a required parameter, includes an invalid parameter value,  (truncated...)
GuzzleHttp\Exception\ClientException Object
(
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    [message:protected] => Client error: `POST https://treacle.cloud/oauth/token` resulted in a `400 Bad Request` response:
{"error":"invalid_request","message":"The request is missing a required parameter, includes an invalid parameter value,  (truncated...)

    [string:Exception:private] => 
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    [file:protected] => /var/www/vhosts/icandydesign.com/httpdocs/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php
    [line:protected] => 113
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                    [line] => 65
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 *RECURSION*
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                    [class] => GuzzleHttp\Client
                    [type] => ->
                    [args] => Array
                        (
                            [0] => post
                            [1] => https://treacle.cloud/oauth/token
                            [2] => Array
                                (
                                    [form_params] => Array
                                        (
                                            [grant_type] => authorization_code
                                            [client_id] => 3
                                            [client_secret] => Kszu3LfHzoAysuu20Dc5KGiaxfEz2FU7Q35XFtSJ
                                            [redirect_uri] => https://www.icandydesign.com/callback
                                            [code] => 
                                        )

                                )

                        )

                )

            [11] => Array
                (
                    [file] => /var/www/vhosts/icandydesign.com/httpdocs/callback.php
                    [line] => 15
                    [function] => __call
                    [class] => GuzzleHttp\Client
                    [type] => ->
                    [args] => Array
                        (
                            [0] => post
                            [1] => Array
                                (
                                    [0] => https://treacle.cloud/oauth/token
                                    [1] => Array
                                        (
                                            [form_params] => Array
                                                (
                                                    [grant_type] => authorization_code
                                                    [client_id] => 3
                                                    [client_secret] => Kszu3LfHzoAysuu20Dc5KGiaxfEz2FU7Q35XFtSJ
                                                    [redirect_uri] => https://www.icandydesign.com/callback
                                                    [code] => 
                                                )

                                        )

                                )

                        )

                )

            [12] => Array
                (
                    [file] => /var/www/vhosts/icandydesign.com/httpdocs/callback.php
                    [line] => 15
                    [function] => post
                    [class] => GuzzleHttp\Client
                    [type] => ->
                    [args] => Array
                        (
                            [0] => https://treacle.cloud/oauth/token
                            [1] => Array
                                (
                                    [form_params] => Array
                                        (
                                            [grant_type] => authorization_code
                                            [client_id] => 3
                                            [client_secret] => Kszu3LfHzoAysuu20Dc5KGiaxfEz2FU7Q35XFtSJ
                                            [redirect_uri] => https://www.icandydesign.com/callback
                                            [code] => 
                                        )

                                )

                        )

                )

            [13] => Array
                (
                    [file] => /var/www/vhosts/icandydesign.com/httpdocs/index.php
                    [line] => 556
                    [args] => Array
                        (
                            [0] => /var/www/vhosts/icandydesign.com/httpdocs/callback.php
                        )

                    [function] => include
                )

        )

    [previous:Exception:private] => 
)