Implement bill manager api

[crispinkoech]

This closes #57.

It adds all of the Bill manager APIs except for the Update Invoice endpoint since the docs contradicts itself on what can/can't be updated.

[c12i]

I agree with @itsyaasir, the bill manager needs to be a feature, and it should probably not be a default feature too

[crispinkoech]

Alright, sound good. How will the public API look like; will it still be something like this?

/// Example: Using the bill manager onboard API
let result = client
    .onboard()
    // call field setters first, then call send
    .send()
    .await
    .unwrap();

[itsyaasir]

@crispinkoech I will review this PR, I am little caught up in the moment, sorry.

[crispinkoech]

No worries, no worries. Take your time

On Tue, 11 Apr 2023, 22:40 Yasir, @.***> wrote:

@crispinkoech https://github.com/crispinkoech I will review this PR, I am little caught up in the moment, sorry.

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[crispinkoech]

Awesome, will do 👍

On Sat, 19 Aug 2023, 15:58 Collins Muriuki, @.***> wrote:

@.**** commented on this pull request.

In src/errors.rs https://github.com/collinsmuriuki/mpesa-rust/pull/66#discussion_r1299183784 :

• [error("Bill manager onboarding failed: {0}")]

• OnboardError(serde_json::Value),

• [error("Bill manager onboarding modify failed: {0}")]

• OnboardModifyError(serde_json::Value),

• [error("Bill manager bulk invoice failed: {0}")]

• BulkInvoiceError(serde_json::Value),

• [error("Bill manager reconciliation failed: {0}")]

• ReconciliationError(serde_json::Value),

• [error("Bill manager single invoice failed: {0}")]

• SingleInvoiceError(serde_json::Value),

• [error("Bill manager cancel invoice failed: {0}")]

• CancelInvoiceError(serde_json::Value),

67 https://github.com/collinsmuriuki/mpesa-rust/pull/67 is merged

already, you can go ahead and rebase to apply the new changes

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[crispinkoech]

Ooops, I don't have write permissions to the main branch, you'll have to merge it yourself @collinsmuriuki