Build a Website Piwigo digital download plugin

1. Real plugin and I can install and active and deactivate and remove it at any time. 2. user can purchase credit with paypal and get credit in user account. 3. Then user can download the files according to how much credit in his account. 4. after download, credit will be take out automatically from user account after he purchase from Payapl INP. real purchase not just click buy now button. 5. Send order to paypal with photo author email and order ID by paypal INP 6. paypal INP also send order info to photo author 7. admin can edit user account credit. credit is read-only in user account. 8. admin and user can set up different size and different price to download. And user account will use admin setup if user does not setup different size and different price. user override admin for download set up and price set up. 9. in user account, purchased photo will be active to download within 7 days. admin can change this. 10. in user account, keep purchased history. like photo ID and more info size etc. 11. User can add any photo and prints order to his light box. user can purchase these photos and prints in the future 12. reasonable requirement related to this features should be free charge. 13. there is already had download by size plugin but it is not good compatible. You can refer it to edit it's open source.