Common php IDE file structure usage

A simple stripe API payment example.
Upon visiting the page, (1) create a customer, (2) create a paymentintent with the customer.
The content of the code field will be included in index.php
Two PHP files will reside in the page dir
app.ini will reside out of doc root dir
index_inc.php will include shared.php
shared.php uses app.ini, which is in the other record
shared.php will use stripe library

doc_base /home/cmsnow/www/hosts/design.asonedemo.com/docs/
/home/cmsnow/www/hosts/design.asonedemo.com/docs/..//default/en-US/nav6h3/E/Dev/s/Stripe/Payment/php/app.ini

array(7) {
  ["DOMAIN"]=>
  string(21) "http://localhost:4242"
  ["PAYMENT_METHOD_TYPES"]=>
  string(4) "card"
  ["PRICE"]=>
  string(15) "price_abc123..."
  ["STATIC_DIR"]=>
  string(9) "../client"
  ["STRIPE_PUBLISHABLE_KEY"]=>
  string(32) "pk_test_5cQYArKzzFMqm4LZbptu9EPe"
  ["STRIPE_SECRET_KEY"]=>
  string(107) "rk_test_515ztjhK6p085J4TOzcIs9anO7ynwFXEPG8z6QqwMiC6UJk3hgcEsk2VVlIgZLcDXU6IP2hDZumFsElgpzU8J1ic400YYMdXUZd"
  ["STRIPE_WEBHOOK_SECRET"]=>
  string(70) "whsec_619acc2ccce06fb6cb07be1b6ac72a907257dddb19fa90be64b7cc84e3218216"
}

Error

Failed to create a PaymentIntent

Please check the server logs for more information