Install Optty Module
Step 1 Module Installation
Install the Optty extension via Magento official Marketplace
https://marketplace.magento.com/optty-magento2-module-payment.html
OR
Install it manually by loading the Optty files into your server.
Unzip the Optty Module and copy the files to your Magento directory
(Magento_Dir)/app/code/
2. Execute Magento setup upgrade:
bin/magento setup:upgrade
3. Clean the cache and generated code:
bin/magento cache:clean
rm -rf var/generation/*
4. Run magento compiler to generate auto-generated classes (this will take some time ...) :
bin/magento setup:di:compile
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