To develop applications or integrate with the MetaMask wallet, you have a few different options depending on your specific requirements. Here are the common methods for MetaMask wallet development:

Build a Metamask Wallet from scratch:

Building a MetaMask wallet from scratch is a complex task that involves understanding the underlying technologies and standards. You're required to provide all the requirements and other things to build a complete crypto wallet like Metamask such as tech stacks, features, etc. The time required to develop is high as everything needs to be initiated from scratch and also cost to develop is also high. 

Buying a Metamask Wallet Clone Script:

Metamask Wallet Clone Script is a replica that imitates the original Metamask Wallet without any infringement. Hence, these clone scripts are 100% customizable, which you can enhance by adding or removing any features and options according to your business requirements. 

These are the most common methods to build your crypto wallet and have a high-profit business for the long term.

Concluding, most entrepreneurs struggle to find the best Crypto Wallet Development Company to build their business. Genuinely, there are a lot of solution providers around the globe. But, choosing an experienced company can be an added advantage for your business. So look for their reviews, clients' feedback, portfolios, their previous works before choosing the company. These could help you to reach the best in the industry.