You can choose the size and look of the pay button and the amount input form. Below are possible variations of the buttons and forms, as well as URLs which need to be used to obtain respective button/form.

Pay buttons
https://auth.robokassa.ru/Merchant/PaymentForm/FormM.js
https://auth.robokassa.ru/Merchant/PaymentForm/FormMS.js
https://auth.robokassa.ru/Merchant/PaymentForm/FormS.js
https://auth.robokassa.ru/Merchant/PaymentForm/FormSS.js
https://auth.robokassa.ru/Merchant/PaymentForm/FormL.js
https://auth.robokassa.ru/Merchant/PaymentForm/FormV.js
Amount input forms
https://auth.robokassa.ru/Merchant/PaymentForm/FormFL.js
https://auth.robokassa.ru/Merchant/PaymentForm/FormFLS.js
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