Table info for paymentapi from 3.6.4, you can run that in phpmyadmin.
Code:
CREATE TABLE " . TABLE_PREFIX . "paymentapi (
paymentapiid INT UNSIGNED NOT NULL AUTO_INCREMENT,
title VARCHAR(250) NOT NULL DEFAULT '',
currency VARCHAR(250) NOT NULL DEFAULT '',
recurring SMALLINT NOT NULL DEFAULT '0',
classname VARCHAR(250) NOT NULL DEFAULT '',
active SMALLINT NOT NULL DEFAULT '0',
settings MEDIUMTEXT,
PRIMARY KEY (paymentapiid)
)
";