# How to integrate This chapter provides the instruction of the integration with the solution and with it's methods. Prior to using this solution is you have to proceed [onboarding](https://developer.verestro.com/books/paytool/page/onboarding) process and you require created account in the Verestro Paytool system.

**Note:** To create an account in the Verestro Paytool system please contact with support.

Environment Test API base URL ``` https://paytool-api.verestro.dev ```
Environment Production API base URL ``` https://paytool-api.verestro.com ```

**Tip:** Below are presented sequence diagrams describing both ways of using the Paytool solution. We recommend using **Redirect you payer** integration path.

Integration method consisting in redirecting the payer to Paytool web view @startuml skinparam ParticipantPadding 30 skinparam BoxPadding 30 skinparam noteFontColor #FFFFFF skinparam noteBackgroundColor #1C1E3F skinparam noteBorderColor #1C1E3F skinparam noteBorderThickness 1 skinparam sequence { ArrowColor #1C1E3F ArrowFontColor #1C1E3F ActorBorderColor #1C1E3F ActorBackgroundColor #FFFFFF ActorFontStyle bold ParticipantBorderColor #1C1E3F ParticipantBackgroundColor #1C1E3F ParticipantFontColor #FFFFFF ParticipantFontStyle bold LifeLineBackgroundColor #1C1E3F LifeLineBorderColor #1C1E3F } actor payer participant "Customer front" as cfront participant "Customer backend" as cback participant "Paytool front" as pfront participant "Paytool backend" as pback payer->cfront: Pay with Paytool cfront->cback: Payer choosed Paytool cback->pback: Customer authorization + transaction metadata pback->pback: Store transaction metadata + open payment session cback<-pback: OK + transaction id cfront<-cback: OK + transaction id cfront->pfront: Redirect + transaction id pfront->pback: Get transaction data + merchant payment methods pfront<-pback: OK response payer<-pfront: Display transaction + payment methods @enduml
Integration method consisting in continuing process via API calls @startuml skinparam ParticipantPadding 30 skinparam BoxPadding 30 skinparam noteFontColor #FFFFFF skinparam noteBackgroundColor #1C1E3F skinparam noteBorderColor #1C1E3F skinparam noteBorderThickness 1 skinparam sequence { ArrowColor #1C1E3F ArrowFontColor #1C1E3F ActorBorderColor #1C1E3F ActorBackgroundColor #FFFFFF ActorFontStyle bold ParticipantBorderColor #1C1E3F ParticipantBackgroundColor #1C1E3F ParticipantFontColor #FFFFFF ParticipantFontStyle bold LifeLineBackgroundColor #1C1E3F LifeLineBorderColor #1C1E3F } actor payer participant "Customer front" as cfront participant "Customer backend" as cback participant "Paytool backend" as pback payer->cfront: Pay with Paytool cfront->cback: Payer choosed Paytool cback->pback: Customer authorization + transaction metadata pback->pback: Store transaction metadata + open payment session cback<-pback: OK + transaction id note right of cback: At this point, the Customer decides how to present the transaction to the payer cback->pback: Request proper payment method / executing 3D Secure cback<-pback: Transaction result note right of cback: At this point, the Customer decides how to present the transaction result to the payer @enduml
## [Methods in API](https://developer.verestro.com/books/paytool/page/paytool-external-api) Our solution provides API method allowing you to order and process transaction by [creating payment session](https://developer.verestro.com/books/paytool/page/paytool-external-api) and send transaction metadata to our system. In order to opening new payment session you receive `transactionId` in response which is unique identifier of the created session. Every ordered transaction has his own payment session. Using `transactionId` you can whether redirect your payer to our Paytool web view or continue the transaction process using other API methods provided by our solution. This section describes all API methods in Paytool solution.

**Tip:** Below there is a description of every single Paytool API method. To see example request bodies please visit complete API documentation is [available here](https://developer.verestro.com/books/paytool/page/paytool-external-api) in SwaggerUI format. Please visit to see our methods.

**Tip:** Detailed information about what is included in the transaction metadata is shown in the `transactionInitialization` method.

[Opening Paytool in iframe](https://paytool.verestro.com/docs/) This section describes the steps you need to take if you want the Paytool form to be displayed as an iframe on your website instead of redirecting your payer to Verestro Paytool website.

**Tip:** This section applies to customers who use the Redirect your payer implementation model. If you use a different integration model with Paytool, you can ignore this chapter.