Cashback opportunities are a great way to save money. Whether it's through credit cards, apps, or online shopping platforms, these strategies can help you to effectively earn while you spend. Here are few types of cashback opportunities:

1. **Cashback Credit Cards**: Many credit cards offer cash back as a reward for making purchases. The proportion of cash back varies from one credit card issuer to another, typically ranges from 1% to 5%. Always keep an eye out for certain promotional periods where the cashback rates increase.

2. **Cashback Websites**: There are many websites that provide cashback options when you make purchases through them. Some popular ones include Rakuten (formerly known as Ebates), TopCashback, and Swagbucks. They partner with a variety of retailers, and when you shop through their sites, you earn a percentage of cash back.

3. **Cashback Apps**: There are also apps that offer cashback options. Some examples are Dosh, Ibotta, and Fetch Rewards. These apps offer cash back when you upload your shopping receipt or link your payment card to the app, and make qualifying purchases at partnered stores.

4. **Store Cashback/Rewards Programs**: Many retailers offer their own cash back or loyalty rewards program. Points can typically be earned on every purchase and later redeemed for discounts or other perks.

5. **Bank Account Cashback**: Some checking accounts also offer cash back on certain debit card purchases. 

Remember, terms and conditions apply for each cash back offer, so clarify these before you commit. Always pay off any credit card balances in full each month to avoid interest charges which could offset your earnings. Tracking your cash back can help you ensure that you're earning the highest returns possible on your spending.

Yes, there are quite a few cashback apps that offer rewards for linking your payment card and making purchases at partnered stores. Here are some examples:

1. **Dosh**: In Dosh, you can link your credit or debit card and then earn cash back for purchases made at participating retailers. The cash back is automatically added to your Dosh Wallet.

2. **Drop**: With Drop, you link your credit or debit card, then earn points for shopping at your favorite stores. You can then redeem those points for gift cards at various popular retailers.

3. **Pei**: Pei is a cashback app that returns a portion of your purchase to you when you shop at partner stores with a linked payment card. Cash back can be converted to bitcoin or cash.

4. **Rakuten (formerly Ebates)**: While known as a cashback site for online shopping, Rakuten now allows you to earn cash back in-store as well by linking your credit card.

5. **Swagbucks**: While Swagbucks is best known for surveys and online shopping, they also have a local cash back program where you can earn by dining at local restaurants.

6. **Spent Money**: This app lets you link your credit or debit cards, choose the places you shop at most often, and earn cash back accordingly.

Remember to review the terms and conditions for each app before linking any bank cards or making purchases. Different apps may have various requirements for earning cash back. Usually, these apps are free to use and sign up for.