paymentCreate
Exaple params value :
[
'idSeller' => 1,
'amount' => 1.99,
'currency' => 'PLN',
'description' => 'product description',
'lang' => 'en',
'p_info' => 'Super online shop',
'firstname' => 'CustomerName',
'lastname' => 'CustomerSurName',
'email' => 'alfa.omega@gmail.com'
'returnUrl' => 'http://return.page.pl/return.html',
'extra' => array( ... ),
'secondaryCallbackUrl' => 'http://return.page.pl/secondaryCallback.html'
]
Returns array with transaction uuid ( eg 'c1a0ca5e-9d57-11e7-abc4-cec278b6b50a' ), payment url etc ... ;