Plug-Tinkoff payment for Wordpress

Not working payment plugin Tinkoff
Introduction:
Wordpress
Woocommerce
Theme: Avada

When you click "Payment" in checking out code fails with the following error:

Order number: 257209
Date: 20.03.2020
Total: 4,285
Payment method: Payment by credit card
Notice: Array to string conversion in /var/www//wp-content/plugins/tinkoff-woocommerce/tinkoff/TinkoffMerchantAPI.php on line 234 Fatal error: Uncaught Error: Call to undefined function curl_init() in /var/www//wp-content/plugins/tinkoff-woocommerce/tinkoff/TinkoffMerchantAPI.php:283 Stack trace: #0 /var/www/wp-content/plugins/tinkoff-woocommerce/tinkoff/TinkoffMerchantAPI.php(218): TinkoffMerchantAPI->_sendRequest( ..., {"OrderId":2572...) #1 /var/www//wp-content/plugins/tinkoff-woocommerce/wc-tinkoff.php(189): TinkoffMerchantAPI->buildQuery(Init, Array) #2 /var/www/wp-includes/class-wp-hook.php(288): WC_Tinkoff->receipt_page(257209) #3 /var/www//wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters (Array) #4 /var/www//wp-includes/plugin.php(478): WP_Hook->do_action(Array) #5 /var/www/wp-content/plugins/woocommerce/templates/checkout/order-receipt.php(44): do_action(woocommerce_rec..., 257209) #6 /var/www/wp-content/plugins/woocommerce/includes/wc-core-functions.php(249): include(/var/www/-...) #7 /var/www/wp-content/plugins/woocommerce/includes/shortcodes/class-wc-shortcode-checkout.php(209): wc_get_template(checkout/order-..., Array) #8 /var/www/wp-content/plugins/woocommerce/includes/shortcodes/class-wc-shortcode-checkout.php(59): WC_Shortcode_Checkout::order_pay(257209) #9 /var/www/wp-content/plugins/woocommerce/includes/class-wc-shortcodes.php(72): WC_Shortcode_Checkout::output() #10 /var/www/wp-content/plugins/woocommerce/includes/class-wc-shortcodes.php(95): WC_Shortcodes::shortcode_wrapper(Array ) #11 /var/www/wp-includes/shortcodes.php(325): WC_Shortcodes::checkout(, , woocommerce_che...) #12 [internal function]: do_shortcode_tag(Array) #13 /var/www/wp-includes/shortcodes.php(199): preg_replace_callback(/[([?)(woocom..., do_shortcode_ta..., [woocommerce_ch...) #14 /var/www/wp-includes/class-wp-hook.php(288): but this do_shortcode([woocommerce_ch...) #15 /var/www/wp-includes/plugin.php(206): WP_Hook->apply_filters ([...woocommerce_ch, Array) #16 /var/ apply_filters(the_content,