- struggled to make ajax works, but now is ok

- starting to make serverside works

plugins/fipfcard_plugin/php/paypal/paypal.php

@@ -0,0 +1,168 @@
+<?php
+
+
+/**
+ * @see https://developer.paypal.com/docs/checkout/standard/integrate/#link-integratebackend
+ */
+
+
+/**
+ *
+ */
+function fipfcard_paypal_order()
+{
+	// json decode from JSON.stringify : https://stackoverflow.com/q/15986235/9497573
+	$data_received = json_decode( html_entity_decode( stripslashes( $_POST['data'] ) ) );
+//	error_log( "data_received" );
+//	error_log( json_encode( $data_received ) );
+
+	// use the cart information passed from the front-end to calculate the order amount detals
+	$cart = $data_received->cart;
+	error_log( "cart" );
+	error_log( json_encode( $cart ) );
+	create_order($cart);
+
+	wp_send_json_success(
+		array(
+			'from paypal_order',
+			"data_received" => $data_received,
+		),
+		200
+	);
+}
+add_action( 'wp_ajax_paypal_orders', 'fipfcard_paypal_order' );
+
+
+
+
+
+
+/**
+ * Generate an OAuth 2.0 access token for authenticating with PayPal REST APIs.
+ * @see https://developer.paypal.com/docs/checkout/standard/integrate/#link-integratebackend
+ * @see https://developer.paypal.com/api/rest/authentication/
+ */
+function generate_access_token( )
+{
+	$base = "https://api-m.sandbox.paypal.com";
+
+	try {
+		if ( !PAYPAL_CLIENT_ID || !PAYPAL_CLIENT_SECRET ) {
+			throw new Error( "MISSING_API_CREDENTIALS" );
+		}
+		$credentials = PAYPAL_CLIENT_ID . ":" . PAYPAL_CLIENT_SECRET;
+		$auth = base64_encode($credentials);
+
+		$url = $base . '/v1/oauth2/token';
+		$body = http_build_query(array('grant_type' => 'client_credentials'));
+		// Initialize curl
+		$ch = curl_init();
+		// Set curl options
+		curl_setopt($ch, CURLOPT_URL, $url);
+		curl_setopt($ch, CURLOPT_POST, true);
+		curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
+		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+		curl_setopt($ch, CURLOPT_HTTPHEADER, array(
+			'Authorization: Basic ' . $auth,
+		));
+		// Execute curl and get the response
+		$data_json = curl_exec($ch);
+
+		if ( $data_json === false)
+			throw new Error('cURL error: ' . curl_error($ch));
+		// Close curl
+		curl_close($ch);
+
+		$data = json_decode($data_json);
+
+    return $data->access_token;
+  }
+	catch (Throwable $error) {
+    error_log("Failed to generate Access Token:");
+    error_log($error->getMessage());
+  }
+};
+/*
+*/
+
+
+
+/**
+ * Create an order to start the transaction.
+ * @see https://developer.paypal.com/docs/api/orders/v2/#orders_create
+ */
+
+function create_order( $cart )
+{
+
+  // use the cart information passed from the front-end to calculate the purchase unit details
+
+  $access_token = generate_access_token();
+	error_log("access_token:");
+	error_log($access_token);
+  
+/*
+
+
+  const url = `${base}/v2/checkout/orders`;
+
+  const payload = {
+
+    intent: "CAPTURE",
+
+    purchase_units: [
+
+      {
+
+        amount: {
+
+          currency_code: "USD",
+
+          value: "100.00",
+
+        },
+
+      },
+
+    ],
+
+  };
+
+  
+
+  const response = await fetch(url, {
+
+    headers: {
+
+      "Content-Type": "application/json",
+
+      Authorization: `Bearer ${accessToken}`,
+
+      // Uncomment one of these to force an error for negative testing (in sandbox mode only). Documentation:
+
+      // https://developer.paypal.com/tools/sandbox/negative-testing/request-headers/
+
+      // "PayPal-Mock-Response": '{"mock_application_codes": "MISSING_REQUIRED_PARAMETER"}'
+
+      // "PayPal-Mock-Response": '{"mock_application_codes": "PERMISSION_DENIED"}'
+
+      // "PayPal-Mock-Response": '{"mock_application_codes": "INTERNAL_SERVER_ERROR"}'
+
+    },
+
+    method: "POST",
+
+    body: JSON.stringify(payload),
+
+  });
+
+  
+
+  return handleResponse(response);
+
+*/
+};
+
+
+
+?>