olaoluwa-98 / laravel-payant

    * @param string $amount         [Mandatory]

    * @param string $channel        [Mandatory - valid ["Cash", "BankTransfer", "POS", "Cheque"]]

    */

    public function addPayment(string $reference_code, string $due_date, string $amount, string $channel){

        if(!$reference_code){

            throw new IsNullOrInvalid("Error Processing Request - Null/Invalid reference_code");

        }

        if(!$due_date){

            throw new IsNullOrInvalid("Error Processing Request - Null/Invalid date");

        }

        if(!$amount){

            throw new IsNullOrInvalid("Error Processing Request - Null/Invalid amount");

        }

        $valid_channels = ["Cash", "BankTransfer", "POS", "Cheque"];

        if(!$channel){

            throw new IsNull("Error Processing Request - Null/Invalid amount");

        }elseif (!in_array(ucfirst($channel), $valid_channels)) {

            throw new IsInvalid("Invalid Channel - Cash, BankTransfer, POS or Cheque");

        }

        $url = "/payments";

        $post_data = [

            'reference_code' => $reference_code,

            'date' => $due_date,

            'amount' => $amount,

            'channel' => $channel

        ];

        return $this->sendRequest('post', $url, ['form_params' => $post_data]);

    }

    * @param string $unit_cost   [Mandatory - Product's unit cost]

    * @param string $type        [Mandatory - Product type 'product' or 'service']

    */

    public function addProduct(string $name, string $description, string $unit_cost, string $type){

        if(!$name){

            throw new IsNull("Error Processing Request - Null/Invalid name");

        }

        if(!$description){

            throw new IsNull("Error Processing Request - Null/Invalid description");

        }

        if(!$unit_cost){

            throw new IsNull("Error Processing Request - Null/Invalid unit_cost");

        }

        //Validate Product Type

        $valid_product_type = ["product", "service"];

        if(!$type){

            throw new IsNull("Error Processing Request - Null/Invalid type");

        }elseif (!in_array(strtolower($type), $valid_product_type)) {

            throw new IsInvalid("Invalid Type - Available options: 'product' or 'service'");

        }

        $url = "/products";

        $post_data = [

            'name' => $name,

            'description' => $description,

            'unit_cost' => $unit_cost,

            'type' => $type

        ];

        return $this->sendRequest('post', $url, ['form_params' => $post_data]);

    }