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Error handling

If one of the parameters is incorrectly transmitted when calling the payment window, an error will appear in the browser console.

Mistake	Description	Recommendations
`Bad sign`	В параметре `params.sign` Passed incorrect value подписи приложения .	1. Check the secure application key `app secure key` . 2. Check that the signature line that forms on the VK Pay side and the line on the server side of your application match. If you make a payment with test credentials, in the browser console in the error description, you can see what the application signature bar should look like before concatenating with the protected application key `app secure key` . 3. Check that the browser does not screen double quotes when forming a signature. 4. Try forming a signature again.
`Параметры запроса и параметры партнёра отличаются`	In the object `params.data` Incorrect value of the seller's signature `merchant_sign` .	Check the seller's private key `merchant_private_key` and try forming a signature again.
`Invalid parameter: ts`	In the object `params.data` the incorrect value of the request creation timestamp has been passed `ts` .	Check the value `ts` : it should be less than the time of sending the request to display the payment window, but not more than an hour. Send a request with the correct value `ts` .
`Invalid parameter: cashback`	In the object `params.data.cashback` passed the incorrect value of the cacheback parameters.	Check the parameters and send the request again.
`Invalid_parameter: amount`	В параметре `params.amount` There is no or incorrect value of the payment amount.	Check the value `amount` Send the request again.
`Не удалось найти получателя по заданным параметрам`	В параметре `params.merchant_id` incorrect indication of your seller ID, which was issued when connecting to the VK Pay system.	Check the value of the identifier `merchant_id` Send the request again.