OpenCart: site update and acquiring connection

Terms of Reference
1. Updating the site and connecting acquiring.
2. OpenCart platform, now the site is on the old version (1.5).
3. There are about 30 products on the site, they must be cleaned (hidden and not deleted) and 10 new products must be added. In the new products there will be 4 modifications (color / size / style ...) necessary for the purchase. Materials for product cards will be provided in finished form.
4. Connect payment acquiring, most likely - Tinkoff.
5. The design remains the same.
6. Set up standard SEO optimization. On SEO, we do only one-time search engine optimization, namely, we configure user queries by keywords
7. Transfer to the new version of OpenCart, a free (preferably) adaptive template.