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Parameter	Mandatory field	Adopted values	Default value		Description
Merchant_ID	Yes	Number			The merchant identifier in IPS Assist
OrderNumber	Yes	128 characters			Order number in the merchant payments system
Delay	No	0 – one-stage operation 1 – double-stage operation	0		Attribute of a bankcard authorization for the double-stage operation mode.
Language	No	RU – Russian, EN – English	Language of legal entity/enterprise		Language of authorized pages
OrderComment	No	4000 characters			Comment.
OrderAmount	Yes	Number, 15 digits, two digits after the delimiter (delimiter '.')			Payment amount, in original currency (e.g., 10.34).
OrderCurrency	No	3 characters	Currency of legal entity/enterprise		Code of currency of the OrderAmount .
Lastname	No	70 characters			Customer's last name.
Firstname	No	70 characters			Customer's first name.
Middlename	No	70 characters			Customer's middle name.
Email	No	128 characters			Customer's e-mail.
Address	No	256 characters			Customer's address.
HomePhone	No	64 characters			Customer's home phone number.
WorkPhone	No	20 characters			Customer's work phone number.
MobilePhone	No	20 characters			Customer's mobile phone number.
Fax	No	20 characters			Customer's fax number.
Country	No	3 characters			Customer's country.
State	No	3 characters			Customer's region.
City	No	70 characters			Customer's city.
Zip	No	25 characters			Customer's post zip code.
URL_RETURN	No	256 characters			Page URL, to where a customer should return after performing his/her payment in the system (option "Go to the shop page" should be enabled in merchant's settings in Personal account). ). It is recommended to use HTTPS protocol for secure communication.
URL_RETURN_OK	No	256 characters	URL_RETURN parameter value, or, if none, return URL parameter after successful authorization, specified in Personal account		Page URL, to where a customer should return after successful performing his/her payment in IPS Assist (option "Go to the shop page" should be enabled in merchant's settings in Personal account)). It is recommended to use HTTPS protocol for secure communication.
URL_RETURN_NO	No	256 characters	URL_RETURN parameter value, or, if none, return URL specified in Personal account		Page URL, to where a customer should return if the payment is not performed in IPS Assist or payment is still in progress (current payment status "In Progress"), see details. The option "Go to the shop using return URL" should be enabled in merchant's settings in Personal account. It is recommended to use HTTPS protocol for secure communication.
CardPayment	No	1 – pay using bankcard; 0 – without using bankcard	1		A customer can perform his/her payment using bankcard, if parameter value 1 has been sent, or the parameter is missing (and bankcard payments are enable for the enterprise)
ERIPPayment	No	1 – use SSIS payment system, 0 – without using SSIS	1		A customer can perform his/her payment using SSIS payment system, if parameter value 1 has been sent, or the parameter is missing (and SSIS payments are enable for the merchant)
MobiconPayment	No	1 – use MobiconPayment payment system, 0 – without using MobiconPayment	1		A customer can perform his/her payment using MobiconPayment payment system, if parameter value 1 has been sent, or the parameter is missing (and MobiconPayment payments are enable for the merchant)
GooglePayPayment	No	1; 0	0		Payment via Google Pay attribute (=1)
ApplePayPayment	No	1; 0	0		Payment via Apple Pay attribute (=1)
SamsungPayPayment	No	1; 0	0		Payment via Samsung Pay attribute (=1)
MirPayPayment	No	1; 0	0		Payment via Mir Pay attribute (=1)
Signature	No*	String		The string is joined according the determined rules. Then the MD5 hash prepared from this string. Hash is signed by private RSA key of the merchant. Key length - 1024. Received bit sequence is a signature. Signature is transferred BASE64 coded string. Attention! The parameter is necessary in order to protect the transmitted data from the possibility of their substitution by intruders. You should also enable the setting for check value or signature in the Personal account.
Checkvalue	No*	String		Request validation code. The string has to be generated as follows: uppercase(md5(uppercase(md5(SALT) + md5(Х)))), where SALT – secret word; Х – the string joined according the determined rules. Note. If the merchant uses request validation code without delimiters, please, contact the support team support@assist.ru Attention! The parameter is necessary in order to protect the transmitted data from the possibility of their substitution by intruders. You should also enable the setting for check value or signature in the Personal account.
RecurringIndicator	No	1 – recurrent payment 0 – nonrecurrent payment	0	Recurring payment indicator
RecurringMinAmount	No/Yes	Number, 15 digits, two digits after the delimiter (delimiter '.')		Min amount of recurrent payments. Mandatory if RecurringIndicator = 1
RecurringMaxAmount	No/Yes	Number, 15 digits, two digits after the delimiter (delimiter '.')		Max Amount of recurrent payments. Mandatory if RecurringIndicator = 1
RecurringPeriod	No/Yes	Number, 3 digits		Frequency of recurrent payments in days. Mandatory if RecurringIndicator = 1
RecurringMaxDate	No/Yes	Date as string in DD.MM.YYYY format		The end date of recurrent payments. Mandatory if RecurringIndicator = 1		Account	No/Yes**	30 symbols/12 digits**	Number of the contract or personal account of the buyer
Disable3DS	No	0 - perform 3D-Secure authorization according to the merchant settings; 1 - fulfill payment without 3-D Secure.	0	Flag of disabling 3-D Secure. The use of this operating mode is possible in agreement with Assist. To configure it, you need to contact the support service (support@assist.ru). When using this parameter, it must also be added to the order signature, which is built according to determined rules.

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