Processing the Payment

woocommerce-authorizenet.php

// Submit payment and handle response
public function process_payment( $order_id ) {
	global $woocommerce;
	
	// Get this Order's information so that we know
	// who to charge and how much
	$customer_order = new WC_Order( $order_id );
	
	// Are we testing right now or is it a real transaction
	$environment = ( $this->environment == "yes" ) ? 'TRUE' : 'FALSE';

	// Decide which URL to post to
	$environment_url = ( "FALSE" == $environment ) 
					   ? 'https://secure.authorize.net/gateway/transact.dll'
					   : 'https://test.authorize.net/gateway/transact.dll';

	// This is where the fun stuff begins
	$payload = array(
		// Authorize.net Credentials and API Info
		"x_tran_key"           	=> $this->trans_key,
		"x_login"              	=> $this->api_login,
		"x_version"            	=> "3.1",
		
		// Order total
		"x_amount"             	=> $customer_order->order_total,
		
		// Credit Card Information
		"x_card_num"           	=> str_replace( array(' ', '-' ), '', $_POST['spyr_authorizenet_aim-card-number'] ),
		"x_card_code"          	=> ( isset( $_POST['spyr_authorizenet_aim-card-cvc'] ) ) ? $_POST['spyr_authorizenet_aim-card-cvc'] : '',
		"x_exp_date"           	=> str_replace( array( '/', ' '), '', $_POST['spyr_authorizenet_aim-card-expiry'] ),
		
		"x_type"               	=> 'AUTH_CAPTURE',
		"x_invoice_num"        	=> str_replace( "#", "", $customer_order->get_order_number() ),
		"x_test_request"       	=> $environment,
		"x_delim_char"         	=> '|',
		"x_encap_char"         	=> '',
		"x_delim_data"         	=> "TRUE",
		"x_relay_response"     	=> "FALSE",
		"x_method"             	=> "CC",
		
		// Billing Information
		"x_first_name"         	=> $customer_order->billing_first_name,
		"x_last_name"          	=> $customer_order->billing_last_name,
		"x_address"            	=> $customer_order->billing_address_1,
		"x_city"              	=> $customer_order->billing_city,
		"x_state"              	=> $customer_order->billing_state,
		"x_zip"                	=> $customer_order->billing_postcode,
		"x_country"            	=> $customer_order->billing_country,
		"x_phone"              	=> $customer_order->billing_phone,
		"x_email"              	=> $customer_order->billing_email,
		
		// Shipping Information
		"x_ship_to_first_name" 	=> $customer_order->shipping_first_name,
		"x_ship_to_last_name"  	=> $customer_order->shipping_last_name,
		"x_ship_to_company"    	=> $customer_order->shipping_company,
		"x_ship_to_address"    	=> $customer_order->shipping_address_1,
		"x_ship_to_city"       	=> $customer_order->shipping_city,
		"x_ship_to_country"    	=> $customer_order->shipping_country,
		"x_ship_to_state"      	=> $customer_order->shipping_state,
		"x_ship_to_zip"        	=> $customer_order->shipping_postcode,
		
		// Some Customer Information
		"x_cust_id"            	=> $customer_order->user_id,
		"x_customer_ip"        	=> $_SERVER['REMOTE_ADDR'],
		
	);

	// Send this payload to Authorize.net for processing
	$response = wp_remote_post( $environment_url, array(
		'method'    => 'POST',
		'body'      => http_build_query( $payload ),
		'timeout'   => 90,
		'sslverify' => false,
	) );

	if ( is_wp_error( $response ) ) 
		throw new Exception( __( 'We are currently experiencing problems trying to connect to this payment gateway. Sorry for the inconvenience.', 'spyr-authorizenet-aim' ) );

	if ( empty( $response['body'] ) )
		throw new Exception( __( 'Authorize.net\'s Response was empty.', 'spyr-authorizenet-aim' ) );
		
	// Retrieve the body's resopnse if no errors found
	$response_body = wp_remote_retrieve_body( $response );

	// Parse the response into something we can read
	foreach ( preg_split( "/\r?\n/", $response_body ) as $line ) {
		$resp = explode( "|", $line );
	}

	// Get the values we need
	$r['response_code']             = $resp[0];
	$r['response_sub_code']         = $resp[1];
	$r['response_reason_code']      = $resp[2];
	$r['response_reason_text']      = $resp[3];

	// Test the code to know if the transaction went through or not.
	// 1 or 4 means the transaction was a success
	if ( ( $r['response_code'] == 1 ) || ( $r['response_code'] == 4 ) ) {
		// Payment has been successful
		$customer_order->add_order_note( __( 'Authorize.net payment completed.', 'spyr-authorizenet-aim' ) );
											 
		// Mark order as Paid
		$customer_order->payment_complete();

		// Empty the cart (Very important step)
		$woocommerce->cart->empty_cart();

		// Redirect to thank you page
		return array(
			'result'   => 'success',
			'redirect' => $this->get_return_url( $customer_order ),
		);
	} else {
		// Transaction was not succesful
		// Add notice to the cart
		wc_add_notice( $r['response_reason_text'], 'error' );
		// Add note to the order for your reference
		$customer_order->add_order_note( 'Error: '. $r['response_reason_text'] );
	}

}