| Parameter name | Validation rule | 
| All parameters except listed below | The following symbols are prohibited and removed < > " = ' / ( ) ; ## | 
| All parameters with URL | The following symbols are prohibited and removed < > %3C %3E symbols &&" are changed to &" | 
| Address , OrderComment | The following symbols are prohibited and removed < > = | 
| OrderNumber, Bill | The following symbols are prohibited and removed < > ' " ; | 
| OrderComment, Address (order), Bill_comment (createbill), Сomment (cancel) | The following symbols are prohibited and removed < > = \ | 
| PNR | The following symbols are prohibited and removed < > " = ' / ( ) ; ## Parameter length is no more than 15 digits | 
| Digital parameters | |
| Merchant_ID, RecurringIndicator (as well as other parameters of type int) | Parameter length is no more than 15 digits Parameter value is no more than 2147483647 | 
| RecurringPeriod, RecurringCount, RecurringPeriodScale (as well as other parameters of type smallint) | Parameter length is no more than 5 digits Parameter value is no more than 32767 | 
| isConvert | Parameter length is no more than 1 digit Parameter value is no more than 4 | 
| cvc2 | The following symbols are prohibited and removed + - . _ \ / and space | 
| delay | Parameter length is no more than 1 digit, accepted values are 0,1,2, | 
